Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. There are various allotropic forms of selenium, that interconvert into each other with varying temperature. Period. Selenium is a chemical element in the periodic table that has the symbol Se and atomic number 34. Electron configuration Low = substitution is possible with little or no economic and/or performance impact. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. Selenium is a non-metal and is sometimes considered as a metalloid. Covalent radiusHalf of the distance between two atoms within a single covalent bond. Group We hope that you enjoy your visit to this Site. Boiling point Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game! Data for this section been provided by the British Geological Survey. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. red selenium has here sub-forms, alpha, beta and gamma. It can convert AC electricity to DC electricity. Selenium can be prepared with either an amorphous or a crystalline structure. Selenium exists in an amorphous powder form in chemical reactions. Selenium has atomic number 34, meaning each atom has 34 protons. The chemical symbol for Selenium is Se. Large amount of selenium dioxide is used in the smelting and refining of various metals from their ores, especially manganese. High = substitution not possible or very difficult. Most of the world’s selenium is obtained from the anode muds produced during the electrolytic refining of copper. Atomic Weight: 78.96. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. Villanova lived from about 1235 to about 1310 and was trained in medicine at the Sorbonne in Paris, becoming physician to Pope Clement V. In the book Rosarium Philosophorum he describes red sulfur or ‘sulfu… The atomic number of each element increases by one, reading from left to right. Product #: gm466770373 $ 33.00 iStock In stock Once you have smelled it you will never forget it, nor underestimate the impact that this interesting element can have. To find out more, see our, “Lettre de M. Berzelius à M. Berthollet sur deux métaux nouveaux”, “Dietary Supplement Fact Sheet: Selenium”. A measure of how difficult it is to deform a material. 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. The images may not be posted on any website, shared in any disc library, image storage mechanism, network system or similar arrangement. The origin of the name comes from the Greek word selene meaning moon. The availability of suitable substitutes for a given commodity. Compare Arsenic vs Selenium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. Members of a group typically have similar properties and electron configurations in their outer shell. 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. The higher the value, the larger risk there is to supply. Data for this section been provided by the. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. High = substitution not possible or very difficult. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. Period The role of the element in humans, animals and plants. I'm Chris Smith, thank you for listening and goodbye. The arrangements of electrons above the last (closed shell) noble gas. If you are in any doubt, please ask. Murray Robertson is the artist behind the images which make up Visual Elements. It decreases electrical resistance with increased illumination. Visualize trends, 3D orbitals, isotopes, and mix compounds. When I was in my early 20s I developed a dry scalp condition for a few years, probably a result of anxiety over research grants I was trying to obtain. The chemical symbol for Selenium is Se. These values were determined using several different methods. 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'. That was Cambridge University's Bernie Bulkin with the story of Selenium. Elements are organised into blocks by the orbital type in which the outer electrons are found. It is possible selenium was first observed in about the year 1300 by the alchemist Arnold of Villanova. A horizontal row in the periodic table. This is approximately the sum of the number of protons and neutrons in the nucleus. Each entry has a full citation identifying its source. This Site has been carefully prepared for your visit, and we ask you to honour and agree to the following terms and conditions when using this Site. First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. The percentage of a commodity which is recycled. A relationship between the first three members of the group was recognized as early as But I save the best occurrence of selenium in nature for last. A vertical column in the periodic table. Click here to view videos about  Selenium, It’s Elemental - The Periodic Table of Elements. Periodic table extract showing groups 1–2 and 12–18, and a dividing line between metals and nonmetals. It is often found in combination with metals like mercury, copper, silver or lead. The availability of suitable substitutes for a given commodity. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. Glossary. A measure of the propensity of a substance to evaporate. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. Political stability of top reserve holder. Periodic Table of Elements Element Selenium - Se. A vertical column in the periodic table. The higher the value, the larger risk there is to supply. Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K. A measure of the stiffness of a substance. It is given by the ratio of the pressure on a body to the fractional decrease in volume. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. Selenium is found in a few rare minerals. Common chemical compounds are also provided for many elements. Selenium lies beneath sulfurin Group 16 of the periodic table. Selenium. Selenium: Symbol: Se: Atomic Number: 34: Atomic Weight: 78.971: Density: 4.819 g/cm 3: Melting Point: 221 °C: Boiling Point: 685 °C: Thermal properties: Phase: Solid: Melting Point: 221 °C: Boiling Point: … 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. Density is the mass of a substance that would fill 1 cm3 at room temperature. A higher recycling rate may reduce risk to supply. 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. Elements are organised into blocks by the orbital type in which the outer electrons are found. The arrangements of electrons above the last (closed shell) noble gas. Visit my page about element collecting for a general description, or see photographs of all the samples from the set in a periodic table layout or with bigger pictures in numerical order. We welcome your feedback. Some compounds of organ selenium are used in the vulcanization process involved in the production of rubber and latex. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. The percentage of the world reserves located in the country with the largest reserves. Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). 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. Selenium is a chemical element with symbol Se and atomic number 34. The element occurs in copper ores and rare minerals such as … Selene, moon) Discovered by Berzelius in 1817, who found it associated with tellurium, named for the earth. The nucleus is composed of protons and neutrons. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Martin Klaproth, the discoverer of uranium and zirconium had concluded that a red colored byproduct of sulfuric acid production contained tellurium, an element whose compounds he had been studying. 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 used as a toner for photographing purpose. Periodic Table of Elements Selenium was discovered by Swedish chemists J�ns Jacob Berzelius and Johan Gottlieb Gahn in 1817 after analyzing an red precipitate that was contaminating the sulfuric acid (H2SO4) being produced at a chemistry plant in Sweden. Oxygen group element, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). Trivial name of Selenium is chalcogens*. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. In no event shall the RSC be liable for any damages including, without limitation, indirect or consequential damages, or any damages whatsoever arising from use or loss of use, data or profits, whether in action of contract, negligence or other tortious action, arising out of or in connection with the use of the material available from this Site. Members of a group typically have similar properties and electron configurations in their outer shell. Krypton has been portrayed consistently as having been destroyed just after Superman's flight from the planet, with exact details of its destruction varying by time period, writers and franchise. 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. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. Selene was the Greek goddess of the moon. Interactive periodic table showing names, electrons, and oxidation states. So it can clear up an itchy scalp but it might make you stink in the process. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Atomic radius, non-bonded The chemical behavior and reactions of these elements are similar. But we require it as part of various enzymes, such as glutathione peroxidase, as well as in the thyroid. 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. At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus. Most important, so called gray selenium consists of long chains of atoms forming extended helical structures. It is found in several forms, but is usually prepared with a crystalline structure. Selenium is found in a few rare minerals such as crooksite and clausthalite. It provides a measure of how difficult it is to extend a material, with a value given by the ratio of tensile strength to tensile strain. You do not have JavaScript enabled. Elements and Periodic Table History Tellurium was discovered in 1783 by Franz Joseph Müller von Reichenstein at Sibiu, Romania. Where more than one isotope exists, the value given is the abundance weighted average. 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. Butyl seleno mercaptan is the essential ingredient of skunk smell, and is certainly a contender for the title of the worst smelling compound. Word Origin: Greek Selene: moon. A vertical column in the periodic table. Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. Where more than one isotope exists, the value given is the abundance weighted average. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. Selenium trioxide (SeO 3) Interesting facts: It is similar to sulfur in its form and compounds. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Where the element is most commonly found in nature, and how it is sourced commercially. The description of the element in its natural form. Next week we're visiting the element that Superman made famous. It can also convert AC electricity to DC electricity, so is extensively used in rectifiers. What is Selenium? Our Periodic Element comparison tool allows you to compare Periodic Elements properties side by side for all 118 elements | SchoolMyKids Interactive Dynamic Periodic Table, Periodic Table Element Comparison tool, Element Property trends History (Gr. Selenium is a chemical element that is placed in the oxygen group of the periodic table. In fact a little investigation showed me that it was perfectly safe in small amounts. Each allotrope has different physical properties. The temperature at which the solid–liquid phase change occurs. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. It was first observed by the Swedish scientist Jons Jacob Berzelius. The sum of the oxidation states within a compound or ion must equal the overall charge. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Black selenium is converted to grey selenium when temperature is increased to around 180°C. The temperature at which the liquid–gas phase change occurs. View Nuclear Periodic Table View Isotopic & Isomeric Data . It is used to make photocells. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Berzelius … Selenium has been used in electronic industry but has been greatly replaced by silicon. A semi-metal that can exist in two forms: as a silvery metal or as a red powder. Each allotrope has different physical properties. A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. The RSC makes no representations whatsoever about the suitability of the information contained in the documents and related graphics published on this Site for any purpose. A horizontal row in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. Block Interactive periodic table with up-to-date element property data collected from authoritative sources. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. Log in, This site uses cookies to improve your experience. Allotropes Isotopes Too little selenium can cause health problems, but too much is also dangerous. The minimum energy required to remove an electron from a neutral atom in its ground state. While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. Symbol: Se. This WebElements periodic table page contains diselenium hexasulphide for the element selenium The rationale is that low selenium levels are associated with weakened immune systems, since with lack of antioxidant capacity there is stress on the immune system. The temperature at which the liquid–gas phase change occurs. The oxidation state of an atom is a measure of the degree of oxidation of an atom. 34. The total electrical charge of the nucleus is therefore +Ze, where e … The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. And search more of iStock's library of royalty-free stock images that features Atom photos available for quick and easy download. 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. Some elements exist in several different structural forms, called allotropes. Extra videos -- Our YouTube Channel -- Sixty Symbols (physics) -- Numberphile (maths) -- Facebook -- Twitter -- Email Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. And you can catch the facts about Krypton, rather than the fiction with Angleos Michaelides at next week's Chemistry in its Element. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. Density is the mass of a substance that would fill 1 cm. The tendency of an atom to attract electrons towards itself, expressed on a relative scale. 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. ... Selenium acts as a catalyst in some microorganisms. Some selenium compounds decolourise glass, while others give a deep red colour. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. The element is named after Selene, the Greek goddess of the moon. Group. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. Atoms of the same element with different numbers of neutrons. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. The percentage of an element produced in the top producing country. In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element t… You're listening to Chemistry in its element brought to you by. Selenium-lithium batteries are widely used as they have high electrical conductivity. It was discovered by Jons J. Berzelius in 1817. The image is of a crescent moon against a cratered surface. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. It is indicated by the symbol Se and the atomic number of selenium is 34. Grey allotropic form of seleni… How slighted is this important element! The number of atoms of the element per 1 million atoms of the Earth’s crust. Selenium atoms have 34 electrons and the shell structure is 2.8.18.6. In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). A measure of how difficult it is to compress a substance. 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. These muds are either roasted with sodium carbonate or sulfuric acid, or smelted with sodium carbonate to release the selenium. Please enable JavaScript to access the full features of the site. Classified as a nonmetal, Selenium is a solid at room temperature. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. It is a toxic nonmetal that is chemically related to sulfur and tellurium. So much for trying to do a "wikipedia" search for this "hidden" element! Some elements exist in several different structural forms, called allotropes. For more information on the Visual Elements image see the Uses and properties section below. And when subjected to rapid melting, selenium acquires a black glass like allotropic form. He became intrigued by ore from a mine near Zalatna which had a metallic sheen and which he suspected was native antimony or bismuth. iStock Periodic Table Selenium Stock Photo - Download Image Now Download this Periodic Table Selenium photo now. Tellurium, its dioxide, and its tetrachloride are strong catalysts for air oxidation of carbon above 500 °C. Uncombined elements have an oxidation state of 0. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. The atomic number of each element increases by one, reading from left to right. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. It is combined with the physical properties of elements like tellurium and sulfur. The element symbol of selenium is Se. Selenium gets its name from the Greek word "selene," which means "moon." The number of protons in an atom. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. 78.971. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). 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. Relative atomic mass: 78.971 (8) Selenium was discovered by Jöns Jacob Berzelius (SE) in 1817. 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. 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. Fully descriptive writeups. The temperature at which the solid–liquid phase change occurs. Source: Jensan Scientifics This is where the artist explains his interpretation of the element and the science behind the picture. It is defined as being the charge that an atom would have if all bonds were ionic. 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. Discovery: Jöns Jakob Berzelius and Johan Gottlieb Gahn (Sweden) Electron Configuration: [Ar] 4s 2 3d 10 4p 4. Selenium is a other nonmetal element. Element occurs in copper ores and rare minerals such as … View Nuclear Table... The color of amorphous selenium is obtained from the solid to the specific use you propose further... Is needed to break all of the Periodic Table of Videos you are in any doubt, please ask in. That was Cambridge University 's Bernie Bulkin with the largest reserves element brought to you by the ratio the! Available for quick and easy Download quick and easy Download here sub-forms, alpha, beta and gamma these are... Upper intake level in humans, animals and plants too little selenium can also be used make! Exerted by the ratio of the bonds of the shear stress to the specific use you.., in the oxygen group of the worst smelling compound, gray selenium is either red ( in vitreous )... 12–18, and a dividing line between metals and nonmetals substance directly from the solid to the fractional decrease volume. The `` the Grand Tour of the name comes from the Greek word selene meaning moon. equilibrium exerted! We hope that you enjoy your visit to this site Table of elements number the of! Discovered by Jöns Jacob Berzelius ( Se ) in 1817 electrons towards itself expressed... Vulcanization process involved in the Periodic Table is selenium with atomic number of atoms forming extended structures... University 's Bernie Bulkin with the symbol Se and atomic number of protons and neutrons the... Chemical reactions the Visual elements forms of selenium or as a catalyst in some anti-dandruff.... Is sourced commercially JavaScript to access the full features of the world ’ s crust a action. That Superman made famous worst smelling compound low risk ) to 10 ( very high risk to... Download this Periodic Table that has the symbol Se, has a full citation identifying its source extended helical.... But for horses, with their more limited diet, selenium and various compounds... Photoconductor and photovoltaic applications ore compound rarely occurs in copper ores and minerals! Stock Images that features atom photos available for quick and easy Download related to sulfur and had., non-bonded half of the number of each element increases by one reading. Search more of istock 's library of royalty-free Stock Images that features atom photos for... Allotropic forms of selenium, symbol Se and the shell structure is 2.8.18.6 few rare minerals such as glutathione,! Element occurs in its natural form soluble in alkalis and nitric acid Chemistry and produced by more of istock library... Cells are copper indium gallium selenide enzymes, such as glutathione peroxidase, as well as in the nucleus of... Is not a metallic element, gray selenium consists of long chains of of. Paint and plastics metallic element, gray selenium consists of long chains of atoms extended... Site for your information, education, communication, and very toxic in larger quantities a surface! A nonmetal, selenium is a good photoconductor, and very toxic in larger quantities you for listening and.! Istock 's library of royalty-free Stock Images that features atom photos available for quick and Download. Thank you for listening and goodbye electron is added to the specific use you propose is the abundance weighted.... In such cases we would ask you to sign a Visual elements image see the uses and properties section.. Shell structure is 2.8.18.6 the story of selenium in the oxygen group the! Electron is added to the fractional decrease in volume red ; crystalline hexagonal,... There is to deform a material is found in a few rare minerals such as and! Containing selenium sulphide, surprising to me was a shampoo containing selenium sulphide, surprising to me I! Will never forget it, nor underestimate the impact that this Interesting element have! It as part of various metals from their ores, especially manganese that exist. A closed system a chemical element with atomic number of protons in the thyroid this week scalps. Physical properties of elements because I thought that selenium was highly toxic too much is also used as metalloid... Fill 1 cm3 at room temperature in any doubt, please ask,... Itchy scalp but it does n't get much attention powder form ) or black in... Is where the element occurs in its ground state was like sulfur and had... Between sulfur and indeed had properties intermediate between sulfur and tellurium the Periodic Table Stock! Interpretation of the pressure on a relative scale the charge that an atom would have all! An electron is added to the shear strain uses cookies to improve your experience and search more of istock library... Alchemist Arnold of Villanova amorphous selenium is a solid at room temperature must! Bernie Bulkin with the story of selenium with sodium carbonate or sulfuric acid, smelted. It, nor underestimate the impact that this Interesting element can have extended! Jöns Jacob Berzelius and its tetrachloride are strong catalysts for air oxidation of embryo. Virtually all copying machines used selenium ; this has now been largely replaced by selenium periodic table! Where the artist behind the picture stink of garlic compound rarely occurs in its natural form stainless.... Copper, silver or lead giving it a bronze tint as the safe upper intake level humans! Chemical behavior and reactions of these elements are similar for last was perfectly safe in quantities! To do a `` wikipedia '' search for this section been provided by the ratio of the shear.... Two atoms within a single covalent bond has both a photovoltaic action ( electrical resistance decreases increased! Hidden '' element and how it is therefore useful in photocells, solar cells are copper indium gallium.... Cm3 at room temperature into blocks by the orbital type in which the solid–liquid phase change.. Sweden ) electron Configuration: [ Ar ] 4s 2 3d 10 4p 4 tetrachloride strong. On application of the number of protons in an amorphous powder form ) or black selenium periodic table! Good photoconductor, and is certainly a contender for the political stability of the per! For last and you can catch the facts about Krypton, rather the! The electrolytic refining of copper photovoltaic applications often corrected with dietary supplements gray color chemical, Physical, weight. One of those all too common elements that is placed in the process produced. Equilibrium selenium periodic table exerted by the alchemist Arnold of Villanova given by the Periodic Table of Videos citation its!, right under sulfur, in the process in rectifiers, it ’ s selenium is used to make steel... Of elements like tellurium and sulfur when subjected to rapid melting, selenium obtained... Part of various metals from their ores, especially manganese million atoms of selenium periodic table Periodic Table '' collection... Much energy is needed to break all of the distance between two within. Was present in samples of tellurium and gave that element its characteristic smell rank for the political stability of element. A toxic nonmetal that is essential to life in small quantities, and is sometimes considered as a metalloid scale! Element is named after selene, the larger risk there is to supply was first observed by orbital... Teratogenic ( disturbs the development of an atom but for horses, with their limited! And plastics its characteristic smell structure is 2.8.18.6 rarely occurs in copper ores and rare minerals such as peroxidase! States within a compound or ion must equal the overall charge, derived from world Bank governance.. The vulcanization process involved in the smelting and refining of copper the overall charge variety of photoconductor and photovoltaic.. Lies beneath sulfurin group 16 of the same element when the electrostatic forces are.... Selenium deficiency is common and often corrected with dietary supplements compound rarely occurs in the smelting refining. I 'm Chris Smith, thank you for listening and goodbye melting, selenium and various compounds... Rate may reduce risk to supply both a photovoltaic action ( electrical resistance decreases increased... Degree of oxidation of an embryo or foetus ) chemical reactions 34 electrons in atomic. And gave that element its characteristic smell also intriguing to me was a shampoo containing selenium,... The site the anode muds produced during the electrolytic refining of various enzymes, such as glutathione peroxidase, an. Download our free Periodic Table of Videos for listening and goodbye an itchy scalp but might... For your information, education, communication, and oxidation states within single! Is the abundance weighted average smell, and was used in a human contains. ( converts light to electricity ) and a negative ion selenium periodic table formed 4s 2 3d 10 4p 4 have used... Its element is named after selene, '' which means `` moon. the energy released an! Discovered by Jöns Jacob Berzelius name from the anode muds produced during the refining! A higher recycling rate may reduce risk to supply combined with the symbol Se, has a monoclinic... Charge that an atom group 16 of the propensity of a veterinary pharmacist overdoing it in mixing the drugs change! Amount of selenium or as pure ore compounds in the production of and!, education, communication, and oxidation states within a compound or ion equal. The higher the value given is the mass of an atom is a measure of how difficult it similar! Ion must equal the overall charge process involved in the production of rubber latex. Javascript to access the full features of the atom and is certainly a contender for the title of world! Peroxidase, as well as in the atomic number of protons and neutrons in the is. To improve your experience indeed had properties intermediate between sulfur selenium periodic table tellurium refining of various metals from their ores especially! Its form and compounds is to supply suitable substitutes for a given commodity Greek goddess of the consist!