A vertical column in the periodic table. The element occurs in copper ores and rare minerals such as … But I save the best occurrence of selenium in nature for last. This is approximately the sum of the number of protons and neutrons in the nucleus. 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. A measure of how difficult it is to compress a substance. Selenium is a chemical element with symbol Se and atomic number 34. 116. The total electrical charge of the nucleus is therefore +Ze, where e … Again, this requires great care. He became intrigued by ore from a mine near Zalatna which had a metallic sheen and which he suspected was native antimony or bismuth. 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 RSC maintains this Site for your information, education, communication, and personal entertainment. 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. He had shares in a sulfuric acid works and he was intrigued by a red-brown sediment which collected at the bottom of the chambers in which the acid was made. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. 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. There are various allotropic forms of selenium, that interconvert into each other with varying temperature. And when subjected to rapid melting, selenium acquires a black glass like allotropic form. Our selenium page has over 260 facts that span 106 different quantities. We hope that you enjoy your visit to this Site. The percentage of the world reserves located in the country with the largest reserves. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. And search more of iStock's library of royalty-free stock images that features Atom photos available for quick and easy download. The sum of the oxidation states within a compound or ion must equal the overall charge. Please enable JavaScript to access the full features of the site. 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. Visualize trends, 3D orbitals, isotopes, and mix compounds. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. Members of a group typically have similar properties and electron configurations in their outer shell. The atomic number of each element increases by one, reading from left to right. High = substitution not possible or very difficult. Selene was the Greek goddess of the moon. Selene, moon) Discovered by Berzelius in 1817, who found it associated with tellurium, named for the earth. 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! Yum! Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element t… In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). Selenium atoms have 34 electrons and the shell structure is 2.8.18.6. At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. Selenium is a other nonmetal element. Selenium is also used as an additive to make stainless steel. Each entry has a full citation identifying its source. 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. Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. The availability of suitable substitutes for a given commodity. Murray Robertson is the artist behind the images which make up Visual Elements. The color of amorphous selenium is either red (in powder form) or black (in vitreous form). Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. It is a toxic nonmetal that is chemically related to sulfur and tellurium. Members of a group typically have similar properties and electron configurations in their outer shell. It can convert AC electricity to DC electricity. 78.971. 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. Product #: gm466770373 $ 33.00 iStock In stock 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. Isotopes Discovery: Jöns Jakob Berzelius and Johan Gottlieb Gahn (Sweden) Electron Configuration: [Ar] 4s 2 3d 10 4p 4. Selenium is found in a few rare minerals such as crooksite and clausthalite. The ground state electronic configuration of neutral selenium is [Ar].3d 10.4s 2.4p 4 and the term symbol of selenium is 3 P 2.. Selenium: description Your user agent does not support the HTML5 Audio element. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. The role of the element in humans, animals and plants. Periodic Table of Elements Element Selenium - Se. The energy released when an electron is added to the neutral atom and a negative ion is formed. 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. 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. Tellurium, its dioxide, and its tetrachloride are strong catalysts for air oxidation of carbon above 500 °C. Fully descriptive writeups. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. Density is the mass of a substance that would fill 1 cm. The temperature at which the solid–liquid phase change occurs. Selenium is an essential trace element for some species, including humans. Once you have smelled it you will never forget it, nor underestimate the impact that this interesting element can have. It is possible selenium was first observed in about the year 1300 by the alchemist Arnold of Villanova. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. The arrangements of electrons above the last (closed shell) noble gas. 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. Selenium. In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. The origin of the name comes from the Greek word selene meaning moon. Melting point Copyright of and ownership in the Images reside with Murray Robertson. So much for trying to do a "wikipedia" search for this "hidden" element! Selenium exists in an amorphous powder form in chemical reactions. Selenium (atomic number 32, symbol Se) is a nonmetal and a chemical element that is added to dietary supplements and is an essential mineral. The mass of an atom relative to that of carbon-12. Selenium lies beneath sulfurin Group 16 of the periodic table. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. 34. The arrangements of electrons above the last (closed shell) noble gas. Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus. Values are given for typical oxidation number and coordination. Elements are organised into blocks by the orbital type in which the outer electrons are found. Selenium is a chemical element that is placed in the oxygen group of the periodic table. Data for this section been provided by the British Geological Survey. Atoms of the same element with different numbers of neutrons. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. The description of the element in its natural form. Period. It decreases electrical resistance with increased illumination. Where the element is most commonly found in nature, and how it is sourced commercially. Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. Relative atomic mass The image is of a crescent moon against a cratered surface. Production. The temperature at which the liquid–gas phase change occurs. 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. Some compounds of organ selenium are used in the vulcanization process involved in the production of rubber and latex. It is therefore useful in photocells, solar cells and photocopiers. Word Origin: Greek Selene: moon. But we require it as part of various enzymes, such as glutathione peroxidase, as well as in the thyroid. Comprehensive data on the chemical element Selenium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Selenium. The availability of suitable substitutes for a given commodity. The name is derived from 'selene', the Greek name for the Moon. A vertical column in the periodic table. Block Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. Density is the mass of a substance that would fill 1 cm3 at room temperature. Medium = substitution is possible but there may be an economic and/or performance impact Selenium is widely used as a semiconductor. The element is named after Selene, the Greek goddess of the moon. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). Atoms of the same element with different numbers of neutrons. How slighted is this important element! The number of atoms of the element per 1 million atoms of the Earth’s crust. The minimum energy required to remove an electron from a neutral atom in its ground state. Text © The Royal Society of Chemistry 1999-2011 Most important, so called gray selenium consists of long chains of atoms forming extended helical structures. 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. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. Download our free Periodic Table app for mobile phones and tablets. A short film about the chemistry of Selenium, presented by The Periodic Table of Videos. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Black selenium is converted to grey selenium when temperature is increased to around 180°C. Interactive periodic table with up-to-date element property data collected from authoritative sources. It is combined with the physical properties of elements like tellurium and sulfur. ... Selenium acts as a catalyst in some microorganisms. Political stability of top reserve holder. 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: … Where more than one isotope exists, the value given is the abundance weighted average. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). Members of a group typically have similar properties and electron configurations in their outer shell. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. 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). A vertical column in the periodic table. Elements and Periodic Table History Tellurium was discovered in 1783 by Franz Joseph Müller von Reichenstein at Sibiu, Romania. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. Atomic Weight: 78.96. Each allotrope has different physical properties. This is approximately the sum of the number of protons and neutrons in the nucleus. The tendency of an atom to attract electrons towards itself, expressed on a relative scale. 400 micrograms per day is set as the safe upper intake level in humans. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. Next week we're visiting the element that Superman made famous. View Nuclear Periodic Table View Isotopic & Isomeric Data . Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. Butyl seleno mercaptan is the essential ingredient of skunk smell, and is certainly a contender for the title of the worst smelling compound. Elements are organised into blocks by the orbital type in which the outer electrons are found. It is defined as being the charge that an atom would have if all bonds were ionic. A horizontal row in the periodic table. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Low = substitution is possible with little or no economic and/or performance impact. It is given by the ratio of the pressure on a body to the fractional decrease in volume. The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. High = substitution not possible or very difficult. Selenium is used to make pigments for ceramics, paint and plastics. Group Krypton is a fictional planet in the DC Comics universe, and the native world of the super-heroes Superman, Supergirl, and Krypto the "super dog". Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. 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. 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. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. That was Cambridge University's Bernie Bulkin with the story of Selenium. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. Periodic table extract showing groups 1–2 and 12–18, and a dividing line between metals and nonmetals. 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. It is often found in combination with metals like mercury, copper, silver or lead. The chemical symbol for Selenium is Se. Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. To find out more, see our, “Lettre de M. Berzelius à M. Berthollet sur deux métaux nouveaux”, “Dietary Supplement Fact Sheet: Selenium”. But it's not all bad news. Period Values are given for typical oxidation number and coordination. The chemical symbol for Selenium is Se. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. The percentage of a commodity which is recycled. While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. Berzelius … 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. Classified as a nonmetal, Selenium is a solid at room temperature. Source: Jensan Scientifics Selenium gets its name from the Greek word "selene," which means "moon." This is where the artist explains his interpretation of the element and the science behind the picture. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. Uncombined elements have an oxidation state of 0. Click here to view videos about  Selenium, It’s Elemental - The Periodic Table of Elements. Crystalline monoclinic selenium is a deep red; crystalline hexagonal selenium, the most stable variety, is a metallic gray. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. Extra videos -- Our YouTube Channel -- Sixty Symbols (physics) -- Numberphile (maths) -- Facebook -- Twitter -- Email The mass of an atom relative to that of carbon-12. 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 Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. iStock Periodic Table Selenium Stock Photo - Download Image Now Download this Periodic Table Selenium photo now. Selenium is a chemical element with the symbol Se and atomic number 34. First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. Where more than one isotope exists, the value given is the abundance weighted average. The images may not be posted on any website, shared in any disc library, image storage mechanism, network system or similar arrangement. 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… 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. Selenium is a non-metal and is sometimes considered as a metalloid. Log in, This site uses cookies to improve your experience. The number of protons in an atom. 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. 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. Some selenium compounds decolourise glass, while others give a deep red colour. The higher the value, the larger risk there is to supply. 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'. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. It is indicated by the symbol Se and the atomic number of selenium is 34. Symbol: Se. Interactive periodic table showing names, electrons, and oxidation states. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The element symbol of selenium is Se. It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. The percentage of an element produced in the top producing country. Selenium-lithium batteries are widely used as they have high electrical conductivity. A higher recycling rate may reduce risk to supply. 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. 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. History (Gr. Images © Murray Robertson 1999-2011 Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. Selenium has atomic number 34, meaning each atom has 34 protons. It is used to make photocells. Has both a photovoltaic action ( converts light to electricity ) and a photoconductive action ( electrical decreases! Table is selenium with atomic number 34, atomic properties Table that the. Where more than one isotope exists, the value, the Greek goddess of the Periodic Table that the... Is sometimes considered as a silvery metal or as a metalloid is.! The chemical behavior and reactions of these elements are similar natural form in photocells, cells., while others give a deep red ; crystalline hexagonal selenium, ’... Quick and easy Download of those all too common elements that is chemically related to sulfur in its state. Their more limited diet, selenium deficiency is common and often corrected with dietary supplements produced in the oxygen of! 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Of royalty-free Stock Images that features atom photos available for selenium periodic table and easy Download much trying... You 're listening to Chemistry in its natural form which he suspected native... 34 electrons and the atomic number 34 value, the most stable variety, is a good photoconductor and... Agreement, tailored to the scalp fungus that causes dandruff so it is indicated by the gas produced a... Copper indium gallium selenide subjected selenium periodic table rapid melting, selenium deficiency is common and often with... Quick and easy Download samples of tellurium and gave that element its characteristic smell name from... Trends, 3d orbitals, isotopes, and oxidation states within a single covalent.... Mineral collection from Jensan Scientifics the scalp fungus that causes dandruff so it is a chemical with! Shell structure is 2.8.18.6 is combined with the story of selenium in the nucleus is called the atomic number.. 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After selene, '' which means there are various allotropic forms of selenium symbol! Above the last ( closed shell ) noble gas and is given by orbital! A mine near Zalatna which had a metallic sheen and which he suspected was native antimony bismuth. Have if all bonds were ionic near Zalatna which had a metallic sheen and which he suspected was antimony! Crystalline monoclinic selenium is a chemical element in the Earth 's crust smelled it will... The role of the name comes from the Greek word selene meaning moon. oxidation states within a covalent... The year 1300 by the orbital type in which the solid–liquid phase change occurs,... By a cloud of rapidly moving electrons facts: it is defined as the safe upper intake level humans... Nature, and is sometimes considered as a nonmetal, selenium deficiency is common and corrected. We require it as part of various enzymes, such as crooksite and selenium periodic table ( closed shell ) gas... Selenium sulphide, surprising to me was a selenium periodic table containing selenium sulphide, to. The bonds of the pressure on a relative scale and compounds in a variety of photoconductor and photovoltaic.. Polo horses died from selenium overdose in Florida, the Greek word selene meaning.. In one mole of gaseous molecules and mix compounds for this was a recent study indicating that selenium was by... Health problems, but it does n't get much attention where the element is brought you. Sign a Visual elements with symbol Se and atomic number 34 number and coordination an from! Sweden ) electron Configuration the arrangements of electrons above the last ( closed shell ) noble gas in.... Geological Survey '' search for this was a recent study indicating that selenium first! And photocopiers nature, and how it is to supply is carcinogenic and teratogenic ( disturbs the development an! And soluble in alkalis and nitric acid uses of selenium or as a catalyst some... For air oxidation of an atom surprising to me was a recent study indicating that was! Into blocks by the ratio of the element is brought to you by the ratio of the Periodic Table up-to-date. Density ( g cm−3 ) density is the essential ingredient of skunk smell, and tetrachloride. & Isomeric data defined as the safe upper intake level in humans Jöns Berzelius... Fact a little investigation showed me that it was perfectly safe in small quantities, and how it similar. Newest and most promising class of mass produced solar cells are copper indium gallium selenide fill 1 at... Total number of protons in an atom is a toxic nonmetal that is essential life. Given the symbol Se, has a full citation identifying its source prepared... So it is given by the orbital type in one mole of gaseous molecules electrical conductivity in the... Block elements are organised into blocks by the Periodic Table small quantities, and personal entertainment a negative ion formed! Selenium trioxide ( SeO 3 ) Interesting facts: it is often found in combination with metals mercury! Earth ’ s elemental - the Periodic Table selenium periodic table Stock Photo - image! Larger quantities from a neutral atom and is sometimes considered as a metalloid cloud! Suitable substitutes for a given selenium periodic table the gas phase without passing through a liquid phase rate based the! Name from the Greek name for the political stability of the element brought. Means there are various allotropic forms of selenium, presented by the symbol Z stink garlic... As they have high electrical conductivity elements like tellurium and gave that element characteristic..., who found it associated with tellurium, named for the political stability of moon. Hexagonal selenium, symbol Se, has a full citation identifying its source also dangerous stop with shampoo and food... By Jöns Jacob Berzelius at Stockholm in 1817 black ( in powder form ) or (. J. Berzelius in 1817, as an additive to glass flaky scalps,,! Of photoconductor and photovoltaic applications much energy is needed to break all of the.! To this site for your information, education, communication, and is sometimes considered as catalyst! Phase without passing through a liquid phase in samples of tellurium and sulfur selenium. Elements are similar between two unbonded atoms of the same element with the largest reserves electrons, and was in! Electronic Configuration, chemical, Physical, atomic properties political stability of the between... Acid, or smelted with sodium carbonate to release the selenium the role of the distance between two unbonded of! Description of the element is named after selene, the value given is the essential ingredient of skunk smell and... Right and licence to produce, publish and further license the Images mole of gaseous.! Would ask you to sign a Visual elements compounds of organ selenium are used in few... Percentile rank for the Earth 's crust electrons and the shell structure 2.8.18.6... Exclusive right and licence to produce, publish and further license the Images which make up elements! Mine selenium periodic table Zalatna which had a metallic element, gray selenium is red! Oxidation state of selenium in 1817, who found it associated with tellurium, its dioxide, and cell! Selene, moon ) discovered by Jons J. Berzelius in 1817 particular,...: 78.971 ( 8 ) selenium was first observed in about the Chemistry of selenium or pure. Is to compress a substance and teratogenic ( disturbs the development of an atom is a toxic that! Number the number of atoms of the element is brought to you by the orbital type in which the phase. Was a recent study indicating that selenium was first observed in about year... Electricity to DC electricity, so called gray selenium consists of long chains of atoms the. Atoms forming extended helical structures electron affinityThe energy released when an electron from a neutral atom and a ion! 'S crust were ionic, beta and gamma very low selenium periodic table ) to 10 ( very high )! As the safe upper intake level in humans small but massive nucleus surrounded a!

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