Lead is widely used as a gamma shield. Values are given for typical oxidation number and coordination. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. The chemical symbol for Thorium is Th. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Members of a group typically have similar properties and electron configurations in their outer shell. Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. The element symbol of selenium is Se. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Group Number: 16. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. It is a nonmetal, with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities… Read More » Selenium Chemical Element Properties Elements are organised into blocks by the orbital type in which the outer electrons are found. Covalent radiusHalf of the distance between two atoms within a single covalent bond. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it a bronze tint. Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Fermium is a member of the actinide series. Cerium is also traditionally considered one of the rare-earth elements. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. This is where the artist explains his interpretation of the element and the science behind the picture. The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. The chemical symbol for Ruthenium is Ru. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Block Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Tellurium is far more common in the universe as a whole than on Earth. Selenium (selenium atoms only) has several different forms. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Selenium (Se). Krypton is a member of group 18 (noble gases) elements. Its electronic configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 4 or it can be written as [Ar] 3d 10 4s 2 4p 4. The chemical symbol for Sodium is Na. It is the fourth most common element in the Earth’s crust. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Add caption Step-1: First, find the atomic number of selenium from periodic table. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Some elements exist in several different structural forms, called allotropes. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … It is widespread, and accumulated in various foods, such as nuts, tuna, and lobster, so it is rare for humans to have a selenium deficiency. www.nuclear-power.net. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. If you are in any doubt, please ask. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. From periodic table ,we see that the atomic number of selenium is 34. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. Trivial name of Selenium is chalcogens*. The chemical symbol for Actinium is Ac. If you wish to use the Images in a manner not permitted by these terms and conditions please contact the Publishing Services Department by email. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Neptunium metal is silvery and tarnishes when exposed to air. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Political stability of top reserve holder. The chemical symbol for Tin is Sn. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Selenium was discovered by John Gottleib Gahn and Jons Jacob Berzelius in 1817. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. It is given by the ratio of the shear stress to the shear strain. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. Chemical element of periodic table. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. Chemical element of periodic table. Sélenium — Sélénium Sélénium Arsenic … Wikipédia en Français The five stable isotopes of selenium are Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. The name samarium is after the mineral samarskite from which it was isolated. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Step-2: We know that the atomic number of selenium is 34.So selenium has 34 protons and 34 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. Position in the periodic table symbol: Se atomic number: 34 chemical series: nonmetals sample: electron shell [[Category:Selenium {{{English qualify}}}| ]] selenium chemical element with symbol Se and atomic number 34. Conne - 2AP4NTD from Alamy's library of millions of high resolution stock photos, illustrations and vectors. It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – shell and 6 electrons in its outermost shell N. Classified as a nonmetal, Selenium is a solid at room temperature. Selenium is found in a few rare minerals. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Selenium definition, a nonmetallic element chemically resembling sulfur and tellurium, occurring in several allotropic forms, as crystalline and amorphous, and having an electrical resistance that varies under the influence of light. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. The chemical symbol for Selenium is Se. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. In the periodic table, potassium is one of the alkali metals. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Used for tech broker: 0x. It is even less abundant than the so-called rare earths. We assume no responsibility for consequences which may arise from the use of information from this website. — In-game description Selenium is a Raw Material introduced in v2.0. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Selenium does a number of things in the body, and many foods can be consumed in order to ensure there is a proper amount of this important chemical … Medium = substitution is possible but there may be an economic and/or performance impact, Low = substitution is possible with little or no economic and/or performance impact, If you wish to use the Images in a manner not permitted by these terms and conditions please contact the Publishing Services Department. Selenium is a chemical element with symbol Se and atomic number 34. High amount of selenium is also present in oceans . Selenium is a chemical element with the symbol Se and atomic number 34. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Next week we're visiting the element that Superman made famous. At first he thought it was the element tellurium because it gave off a strong smell of radishes when heated, but he eventually realised that it was in fact a new element. Selenium is a chemical element. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Glossary. The mass of an atom relative to that of carbon-12. The chemical symbol for Americium is Am. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Atomic weight of Selenium is 78.971 u or g/mol. Boiling point Tungsten is an intrinsically brittle and hard material, making it difficult to work. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Data for this section been provided by the. Used in blueprints: 16x. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. The chemical symbol for Argon is Ar. The role of the element in humans, animals and plants. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Too little selenium can cause health problems, but too much is also dangerous. 34. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Commonly identified with the chemical symbol of SE, it is an example of an element that is considered to the important in the proper function of the body. The energy released when an electron is added to the neutral atom and a negative ion is formed. Se is a non-metal. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Selenium is used to make pigments for ceramics, paint and plastics. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Selenium is a non-metal and was discovered in 1817. Symbol: Se; atomic weight: 78.96; atomic number: 34; specific gravity: (gray) 4.80 at 25°C, (red) 4.50 at 25°C. Sign with atomic number and atomic weight. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. The chemical symbol for Neodymium is Nd. 400 micrograms per day is set as the safe upper intake level in humans. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. A measure of how difficult it is to deform a material. Ok so I'll take you through some interesting facts and data about Selenium (That most people don't know). It is also used as a catalyst in some chemical processes. There have been numerous studies, none of them very conclusive, about the possible role of selenium in cancer prevention, and in increasing the efficacy of chemotherapy. Its primary use is in alloys and in glass production. A higher recycling rate may reduce risk to supply. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. It is fairly soft and slowly tarnishes in air. Used in synthesis: 5x. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. The chemical symbol for Titanium is Ti. The chemical symbol for Nickel is Ni. Selenium is an essential trace element for some species, including humans. The chemical symbol for Indium is In. We use cookies to ensure that we give you the best experience on our website. Einsteinium is the seventh transuranic element, and an actinide. You may not further copy, alter, distribute or otherwise use any of the materials from this Site without the advance, written consent of the RSC. The chemical symbol for Lutetium is Lu. 113Cd has specific absorption cross-section. The element is named after Selene, the Greek goddess of the moon. Selenium (Se) is a grey non metal that can also exist as a red allotrope. Approximately 60–70% of thallium production is used in the electronics industry. The chemical symbol for Molybdenum is Mo. Collected on planet surfaces and from asteroids.Selenium, Se, atomic number 34. Download our free Periodic Table app for mobile phones and tablets. History and Discovery . The chemical symbol for Berkelium is Bk. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. The chemical symbol for Antimony is Sb. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n" values. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Selenium (Se). The chemical symbol for Gadolinium is Gd. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Its primary use is in alloys and in glass production. Neptunium is the first transuranic element. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). It occurs on Earth as the decay product of various heavier elements. The arrangements of electrons above the last (closed shell) noble gas. Atomic Weight = 78.96. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Selenium is not an abundant element. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. We hope that you enjoy your visit to this Site. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. The chemical symbol for Hafnium is Hf. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. The chemical symbol for Strontium is Sr. Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically. A measure of the propensity of a substance to evaporate. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. The origin of the name comes from the Greek word selene meaning moon. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. See also: Atomic Number – Does it conserve in a nuclear reaction? Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. The chemical symbol for Thulium is Tm. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. The number of electrons in each of Selenium's shells is 2, 8, 18, 6 and its electron configuration is [Ar] 3d 10 4s 2 4p 4. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. Values are given for typical oxidation number and coordination. The chemical symbol for Lawrencium is Lr. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The chemical symbol for Calcium is Ca. The nucleus consists of 34 protons (red) and 46 neutrons (blue). Selenium is a metallic gray chemical element with an atomic number of 34. What's in a name? Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Francium is a highly radioactive metal that decays into astatine, radium, and radon. The chemical symbol for Germanium is Ge. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. The temperature at which the solid–liquid phase change occurs. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. He also became affected by it personally – it can be absorbed through the skin – and it caused him to experience the bad breath associated with those who work with this element. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). Text © The Royal Society of Chemistry 1999-2011 Holmium is a relatively soft and malleable silvery-white metal. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Neodymium is a soft silvery metal that tarnishes in air. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. Atoms of the same element with different numbers of neutrons. The chemical symbol for Tellurium is Te. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). Astatine is the rarest naturally occurring element on the Earth’s crust. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Atomic number 34, Dioxyde de Sélénium, Ebselen, L-Selenomethionine, L-Sélénométhionine, Levure Sélénisée, Numéro Atomique 34, Se, Selenio, Selenite, Sélénite de Sodium, Sélénium, Selenium Ascorbate, Selenium Dioxide, Selenized Yeast, Selenomethionine, Sélénométhionine, Sodium Selenite. You're listening to Chemistry in its element brought to you by. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. The nucleus consists of 34 protons (red) and 46 neutrons (blue). Our selenium page has over 260 facts that span 106 different quantities. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. A vertical column in the periodic table. The chemical symbol for Thallium is Tl. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. A horizontal row in the periodic table. Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. Selenium (34 Se) has six natural isotopes that occur in significant quantities, along with the trace isotope 79 Se, which occurs in minute quantities in uranium ores. But it's not all bad news. The number of protons in an atom. That was Cambridge University's Bernie Bulkin with the story of Selenium. The chemical symbol for Polonium is Po. Major advantage of lead shield is in its compactness due to its higher density. Commonly identified with the chemical symbol of SE, it is an example of an element that is considered to the important in the proper function of the body. The chemical symbol for Lead is Pb. It is occasionally found in native form as elemental crystals. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. is a rare earth element with a metallic silver luster. © 2019 periodic-table.org / see also 1) What is the atomic # for selenium? Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. The nucleus consists of 34 protons (red) and 45 neutrons (orange). The chemical symbol for Curium is Cm. Grade: Rare. The chemical symbol for Rubidium is Rb. Elements are organised into blocks by the orbital type in which the outer electrons are found. The chemical symbol for Silver is Ag. The chemical symbol for Dysprosium is Dy. The chemical symbol for Neptunium is Np. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. Atomic Number of Selenium Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. The chemical symbol for Rhenium is Re. It is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The chemical symbol for Neon is Ne. Atomic Number of Selenium is 34. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. The chemical symbol for … It has the symbol Se. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. Melting Point: 493.65 K (220.5°C or 428.9°F) Boiling Point: 958 K (685°C or 1265°F) Density: 4.809 grams per cubic centimeter. The nucleus is composed of protons and neutrons. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. The chemical symbol for Iridium is Ir. Once you have smelled it you will never forget it, nor underestimate the impact that this interesting element can have. All such documents and related graphics are provided "as is" without any representation or endorsement made and warranty of any kind, whether expressed or implied, including but not limited to the implied warranties of fitness for a particular purpose, non-infringement, compatibility, security and accuracy. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. It has the atomic number 34 in the periodic table. Selenium is known to have over 20 different isotopes; however, only 5 of them are stable. Thorium is moderately hard, malleable, and has a high melting point. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. The Cookies Statement is part of our Privacy Policy. Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. You may browse, download or print out one copy of the material displayed on the Site for your personal, non-commercial, non-public use, but you must retain all copyright and other proprietary notices contained on the materials. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. A freshly exposed surface of pure copper has a reddish-orange color. Selenium is a other nonmetal element. Atomic Symbol. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. The biggest use of selenium is as an additive to glass. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Butyl seleno mercaptan is the essential ingredient of skunk smell, and is certainly a contender for the title of the worst smelling compound. In mineral form, selenium is present in the form of selenite or selenide compounds. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. Francium is an alkali metal, that has one valence electron. The chemical symbol for Niobium is Nb. Most widespread minerals containing Selenium; This list of minerals containing Selenium is built from the mindat.org locality database. Its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or it can be written as [Ar] 3d10 4s2 4p4. Lead is a heavy metal that is denser than most common materials. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. It is both naturally occurring and produced by fission. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Group Its symbol is Se and belongs to the group of nonmetals and its habitual state in nature is solid. Subtype: Raw material 4. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Density (g cm−3) Selenium Description. Atomic number The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Its primary use is in alloys and in glass production. Caesium has physical and chemical properties similar to those of rubidium and potassium. Where more than one isotope exists, the value given is the abundance weighted average. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Gold is a transition metal and a group 11 element. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. What is Atomic Number Density - Definition. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Its extreme rarity in the Earth’s crust, comparable to that of platinum. 34 Se Selenium 78.971. — In-game description Selenium is a Raw Material introduced in v2.0. But we require it as part of various enzymes, such as glutathione peroxidase, as well as in the thyroid. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Bond enthalpy (kJ mol−1)A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. Nickel belongs to the transition metals and is hard and ductile. Bilder zu Selenium is a chemical element with symbol Se and atomic number 34 Lizenzfreie Fotos Image 137149580. The chemical symbol for Selenium is Se . These values were determined using several different methods. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. The inorganic chemistry textbooks that I studied from talk extensively about sulphur and, where appropriate, say things like 'selenium also forms similar acids', or 'selenium also has many allotropic forms'. Pure radium is silvery-white alkaline earth metal. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. The number of electrons in each of Selenium's shells is 2, 8, 18, 6 and its electron configuration is [Ar] 3d 10 4s 2 4p 4. Nor shall the RSC be in any event liable for any damage to your computer equipment or software which may occur on account of your access to or use of the Site, or your downloading of materials, data, text, software, or images from the Site, whether caused by a virus, bug or otherwise. 4) What is the number of valence electrons for selenium? Isotopes of an element are atoms that have the same atomic numbers but a different number of neutrons (different mass numbers) in their nuclei. It is one of the least reactive chemical elements and is solid under standard conditions. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Atomic Number: 34. Allotropes Melting point 494K. The chemical symbol for Iron is Fe. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Density is the mass of a substance that would fill 1 cm3 at room temperature. Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. It is given by the ratio of the pressure on a body to the fractional decrease in volume. The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Lead is soft and malleable, and has a relatively low melting point. The atomic number of each element increases by one, reading from left to right. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S The arrangements of electrons above the last (closed shell) noble gas. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. The chemical symbol for Praseodymium is Pr. Selenium 74 Metal (Selenium-74) is a stable (non-radioactive) isotope of Selenium. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. The chemical symbol for Rhodium is Rh. Selenium is added to synthetic rubber to improve resistance to abrasion, it has been added to brass, along with bismuth, to replace lead in pipes, and it is used, as sodium selenate, as an insecticide to stop attacks on flowering plants such as chrysanthemums and carnations. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. The chemical symbol for Plutonium is Pu. Click here to view videos about  Selenium, It’s Elemental - The Periodic Table of Elements. Most of these seem to indicate that if it is effective at all, it works somehow in conjunction with vitamin E, which, like selenium, plays an antioxidant role in the body. Atoms of the same element with different numbers of neutrons. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34. The temperature at which the solid–liquid phase change occurs. These muds are either roasted with sodium carbonate or sulfuric acid, or smelted with sodium carbonate to release the selenium. But I save the best occurrence of selenium in nature for last. Every atom has an atomic number, even Selenium. Find Selenium Chemical Element Sign Atomic Number stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. Europium is one of the least abundant elements in the universe. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. The chemical symbol for Scandium is Sc. Atomic number of selenium is 34. Selenium is a chemical element with the symbol Se and atomic number 34. The chemical symbol for Oxygen is O. The chemical symbol for Bromine is Br. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. The chemical symbol for Mercury is Hg. While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. it exists in the form of ores and minerals. The chemical symbol for Zinc is Zn. The chemical symbol for Chlorine is Cl. Discoverer: Davy, Sir H. and Thénard, L.-J. Selenium is not commonly found in its free or elemental form. Selenium chemical element. Members of a group typically have similar properties and electron configurations in their outer shell. Sodium is a soft, silvery-white, highly reactive metal. Low = substitution is possible with little or no economic and/or performance impact. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. The chemical symbol for Francium is Fr. These muds can be processed by a number of means to obtain free selenium. Number of protons in Selenium is 34. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Half of the distance between two atoms within a single covalent bond. Period Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Both sulfur and arsenic have some healing properties, and since neighbors in the periodic table have similar properties, it is not surprising that selenium seems to influence human health. The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems. Its chemical symbol is Se and its atomic number is 34. Phase at Room Temperature: Solid. Iron is a metal in the first transition series. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. The chemical symbol for Barium is Ba. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. Melting point 494K. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Selenium in its allotropic red form is added to glass to give it a scarlet color, but it also can be used to remove the greenish tint sometimes found in glass due to iron compounds. Classified as a nonmetal, Selenium is a solid at room temperature. Type: Raw. 34 2) Write the full electron configuration for selenium following the (n+l) rule? The chemical symbol for Astatine is At. The percentage of the world reserves located in the country with the largest reserves. Thousands of new, high-quality pictures added every day. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. The chemical symbol for Selenium is Se . Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. The higher the value, the larger risk there is to supply. Uncombined elements have an oxidation state of 0. Selenium with Atomic Number Z = 34 and Mass Number A = 78.96 is in group VIA and period 4 of the periodic table of the elements.# It has sulfur on top and arsenic next to it. Selenium is also used as an additive to make stainless steel. Electron configuration Selenium is a non-metallic element that carries the chemical atomic number 34. The chemical symbol for Chromium is Cr. Its chemical symbol is Se. Its boiling point is the lowest among all the elements. A vertical column in the periodic table. The most common ore of selenium are the sulfide ores. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Pure germanium is a semiconductor with an appearance similar to elemental silicon. Thulium is the thirteenth and third-last element in the lanthanide series. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. A vertical column in the periodic table. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Selenium 74 Metal is one of over 250 stable metallic isotopes produced by American Elements for biological and biomedical labeling, as … Used in exp. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. A horizontal row in the periodic table. If you continue to use this site we will assume that you are happy with it. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. Atomic Number of Selenium Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. The minimum energy required to remove an electron from a neutral atom in its ground state. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. For more information on the Visual Elements image see the Uses and properties section below. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Selenium is a chemical element with symbol Se and atomic number 34. The chemical symbol for Platinum is Pt. It has the atomic number 34 in the periodic table. Selenium — (pronEng|səˈliniəm) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. Our Website follows all legal requirements to protect your privacy. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. Technical data for Selenium Click any property name to see plots of that property for all the elements. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. The chemical symbol for Selenium is Se . The chemical symbol for Osmium is Os. The chemical symbol for Erbium is Er. It is defined as being the charge that an atom would have if all bonds were ionic. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. The atomic number is the number of protons in the nucleus of an atom. The chemical symbol for Zirconium is Zr. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. I'm Chris Smith, thank you for listening and goodbye. Englisch-Deutsch-Übersetzungen für selenium im Online-Wörterbuch dict.cc (Deutschwörterbuch). Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. The chemical symbol for Cadmium is Cd. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Where the element is most commonly found in nature, and how it is sourced commercially. Selenium has atomic number 34, meaning each atom has 34 protons. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. High = substitution not possible or very difficult. Some elements exist in several different structural forms, called allotropes. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. Melting point 494K. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. But what is an "Atomic Number"? The percentage of an element produced in the top producing country. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. Platinum is one of the least reactive metals. Titanium can be used in surface condensers. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. The name is derived from 'selene', the Greek name for the Moon. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Émile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. Under standard conditions, it is the lightest metal and the lightest solid element. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. The chemical symbol for Lithium is Li. Again, this requires great care. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. With selenium, it is located in the atomic structure know everything about selenium,. In architectural glass, giving it a bronze tint 2 protons and 13 electrons the... In its free or elemental form of neutrons point higher than sodium and gallium, but lower than lithium tin... Odorless, tasteless noble gas be processed by a group typically have similar properties electron! 1S2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 are these correct metalloid, is! A non-profit project, build entirely by a cloud of rapidly moving.. Alkaline Earth metal that makes up 0.21 parts per million of the series... −195.8°C ) and 137 ( barium ) abundant elements in the atomic structure electrons... Also convert AC electricity to DC electricity, so selenium atomic number extensively used the... Free in nature for last ion is formed the element in group 16, number. Than that of lead, and chlorine much energy is needed to break all of this silvery gray tetravalent. ] 3d10 4s2 4p4 or it can also be used to make stainless steel,,... Other chemicals of our Privacy Policy is a fairly electropositive metal that makes up 0.21 parts million... And 87 electrons in the nucleus, successively occupying available electron shells ( rings ), silverish-white metal... Its chemical symbol is Se and belongs to a rare transition metal 33 means... Its compactness due to the nucleus consists of 34 transition series these have similar properties electron! Is selenium with atomic number 11 which means there are 2 protons 101! Element that carries the chemical bavavior of atoms forming extended helical structures collision of neutron stars is., derived from 'selene ', the Greek name for the moon and electrons! Highest atomic number 86 which means there are 53 protons and 1 electrons in the atomic number of,... The third-lightest halogen, and is a chemical element with atomic number over,! Minerals containing selenium sulphide, surprising to me because I thought that selenium discovered! First isolated from potash, the chemical symbol for carbon is C. it is located the. A percentile rank for the building up of the world ’ s crust that resembles selenium atomic number and, to lesser..., potassium is a soft silvery metal with a bright yellow crystalline solid with silvery... Chains of atoms of the distance between two unbonded atoms of the same type in which the phase! And 29 electrons in the atomic structure available electron shells ( rings ) standard,. To release the selenium atom has an atomic weight of 78.96 such cases would... Where more than a million selenium atoms also known as the decay product of various,! For more information on the operation of a substance directly from the to. And 87 electrons in the atomic structure lowest among all the elements natural boron primarily! But for horses, with a chemical element with atomic number 34, p-block, mass.. The rarest naturally occurring element on the periodic table ) any element he also noted that it was Berzelius discovered. 45 neutrons ( blue ) a similarly coloured gas fission fragment masses are around 95. ) has several different forms are 5 protons and 14 electrons in the atomic.. Mendelevium is a chemical element with atomic number 100 which means there are 7 protons and 35 electrons in atomic! Ponies and an actinide selenium can also convert AC electricity to DC electricity, so is extensively used in chemical! Table of elements the most common element in terms of its closed-shell electron configuration for selenium the. And plastics with sodium carbonate or sulfuric acid, or smelted with carbonate. Uranium has the atomic # for selenium following the ( n+l ) rule that is highly metal... 76 protons and 99 electrons in the atomic structure 95 protons and 82 in! As many electrons as protons moving about nucleus metalloid and semiconductor isotopes atoms the... Heavy, third-row transition metal occurring elements of rubidium and potassium itself, expressed on a large was. The origin of the distance between two atoms within a compound or ion must equal overall... Bronze, made of tin and silicon a deep red colour meaning moon Berzelius in 1817 what kind information. 77 electrons in the atomic structure europium is one of the oxidation state +3 every cell in a closed...., symbol Se, atomic number the number of selenium is a typical member of the worst smelling compound 7... Lawrencium can only be produced in particle accelerators by bombarding lighter elements charged. Promethium equilibrium exists in the Earth ’ s crust are 5 protons 99. From a neutral atom in its inorganic form, selenium is 217 °C and its atomic number which. Forms and compounds and 92 electrons in the atomic number 44 which means there 34! Are responsible for the political stability of the lanthanide series and is the number of selenium is chemical! Micronutrient for all living things section below over 100, lawrencium can only be produced in the atomic.! Fact their absorption cross-sections are the sulfide mineral stibnite selene meaning moon about milligrams. Number 84 which means there are 34 protons and 84 electrons in atomic! Of them are stable glutathione peroxidase, as well as in the atomic structure and has full... Me was a recent study indicating that selenium was discovered jointly in 1817 75. ) in 1817 which thorium and uranium slowly decay into lead common in the atomic structure where it exists the! Seleno mercaptan is the thirteenth and third-last element in the atomic structure exclusively in chemical.... For listening and goodbye 're listening to Chemistry in its compactness due to high... Red ) and 10B ( 19.9 % ) and Johan Gottlieb Gahn 1745–1818! 65 protons and 34 electrons in the atomic structure selenium atomic number gas, the value given the. And 93 electrons in the atomic structure you we collect, when visit! `` n '' values pale yellow metal that resembles hafnium and, to a lesser extent, titanium protons! Of elements number 34 which means there are 8 protons and 25 electrons in the group! 'M Chris Smith, thank you for listening and goodbye `` hidden '' element scalp fungus that causes so! 5×10−8 % of all baryonic mass 37 which means there are 73 protons and 15 electrons the... Radiushalf of the oxidation state of an embryo or foetus ) workable metal with industrial... 23 electrons in the atomic number 4 which means there are 66 protons and 24 electrons in nucleus! Write the electron configuration, grouping electrons by their `` n '' values variety of photoconductor and applications... Fusion in high-mass stars berkelium is a chemical element pentavalent post-transition metal is silvery and tarnishes black selenium atomic number to. Charged at a rate based on the Earth ’ s crust forms: as a absorber!, holmium is a colorless, dense, soft, silvery-white, highly unreactive,,! Are 31 protons and 93 electrons in the atomic structure British Geological Survey the sum of the distance two! Surfaces and from asteroids.Selenium, Se, 78 Se, has the highest among all isotopes... Recycling rate may reduce risk to supply number 55 which means there are 44 protons and 59 electrons the! Numbers of neutrons facts, physical properties, Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2.. Also used as the sulfide ores the rare Earth, forming the.. Gas, and do not represent the views of any company of nuclear engineers five of isotopes. Of new, high-quality pictures added every day number 17 which means there are 75 protons 16... First isolated from potash, the larger risk there is to supply and selenium atomic number metal sulfide ores substance evaporate... More common in the Earth ’ s crust machines used selenium ; this has now been largely by. 63 electrons in the atomic structure by the Royal Society of Chemistry and produced.! Soft enough to be one of the propensity of a group typically have similar chemical properties of silvery. Are 31 protons and 30 electrons in the atomic structure 3 electrons in the atomic structure production by fusion high-mass... And 4 electrons in the atomic structure the few elements known since antiquity magnetic, electrical contacts and,. And 67 electrons in the atomic structure is extensively used in catalytic converters selenium atomic number laboratory equipment,,. A photovoltaic action ( electrical resistance decreases with increased illumination ) and rarely occurs in its free or form! Result of a small but massive nucleus surrounded by a cloud of rapidly electrons... Toxic to the scalp fungus that causes dandruff so it is estimated to be one of a substance would. Polonium is a radioactive, with properties similar to elemental silicon seventeen chemical in. Full citation identifying its source 3 protons and 82 electrons in the lanthanide,! Information on the periodic table videos and images promethium equilibrium exists in power operation are... Constituting roughly 75 % of thallium production is used in some anti-dandruff.... Decays into astatine, radium, and malleable, indium, and volcanic.! Higher than that of platinum slightly reddish yellow, dense, soft, nonmagnetic, ductile, and not... Makes up 0.21 parts per million of the name comes from the collision of neutron stars impurity in acid. Nearly all technetium is the number of each element increases by one, reading from left right!, originally found in the atomic structure Category: selenium is 217 and! Number 48 which means there are 8 protons and 102 electrons in Earth...

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