The element occurs in copper ores and rare minerals such as clausthalite, crooksite, and eucairite. Most of the world’s selenium is obtained from the anode muds produced during the electrolytic refining of copper. Selenium was discovered jointly in 1817 by Swedish chemists Jöns Jakob Berzelius (1779–1848) and Johan Gottlieb Gahn (1745–1818). These values were determined using several different methods. Atomic Number: 34. Click here to view videos about  Selenium, It’s Elemental - The Periodic Table of Elements. In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). Members of the oxygen family become more active as you move upward on the periodic table. A measure of the propensity of a substance to evaporate. The temperature at which the solid–liquid phase change occurs. Block The chemical symbol for Selenium is Se. Phase at Room Temperature: Solid. It is a nonmetal element with the atomic number 34. 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. It has 34 protons and 34 electrons and a mass number of 78.96. It is given by the ratio of the shear stress to the shear strain. Selenium (atomic number 32, symbol Se) is a nonmetal and a chemical element that is added to dietary supplements and is an essential mineral. Members of a group typically have similar properties and electron configurations in their outer shell. Selenium is in period 4 on the periodic table. 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 is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. 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. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. How slighted is this important element! Symbol of the selenium element is Se. The role of the element in humans, animals and plants. I'm Chris Smith, thank you for listening and goodbye. The Atomic number, Atomic mass and the number of valance electrons all increase from left to right. 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. Atomic weight of Selenium is 78.971 u or g/mol. More... Molecular Weight: 74.922523 g/mol. State of Selenium is Solid at standard temperature and pressure Selenium is also found in amino acids in living organisms, where it exists in the form of seleno-methionine, and selenocysteine . 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. Selenium in its pure form can not be found on the surface of our planet, but it exists in some rare minerals and special muds. Selenium, isotope of mass 75. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. The availability of suitable substitutes for a given commodity. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. These values were determined using several different methods. Melting point 494K. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. We hope that you enjoy your visit to this Site. Number … Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. Atomic Number – Protons, Electrons and Neutrons in Polonium. Density: 4.809 grams per cubic centimeter 5. Atomic numbers pics is a collection of sciencetuts. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). Download our free Periodic Table app for mobile phones and tablets. While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. Collected on planet surfaces and from asteroids.Selenium, Se, atomic number 34. A semi-metal that can exist in two forms: as a silvery metal or as a red powder. 400 micrograms per day is set as the safe upper intake level in humans. A vertical column in the periodic table. Name: Selenium Symbol: Se Atomic Number: 34 Atomic Mass: 78.96 amu Melting Point: 217.0 °C (490.15 K, 422.6 °F) Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F) Number of Protons/Electrons: 34 Number of Neutrons: 45 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 4.79 g/cm 3 Color: gray Atomic Structure Selenium is a metalloid with atomic number 34 (discovered in 1817 by J. J. Berzelius) that has been demonstrated to be essential for living organisms. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Selenium is an element 34 protons and 46 neutrons. Know everything about Selenium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure. Selenium element symbol isolated on white background; Selenium chemical element. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. Technical data for Selenium Click any property name to see plots of that property for all the elements. Selenium is used to make pigments for ceramics, paint and plastics. Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. The atomic number of a chemical element is the number of protons found in the nucleus of the atom of that element. Once you have smelled it you will never forget it, nor underestimate the impact that this interesting element can have. 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. 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. The element is named after Selene, the Greek goddess of the moon. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. 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. 1 Structures Expand this section. Connected lines with dots. Connected lines with dots. element symbol for selenium stock illustrations So it can clear up an itchy scalp but it might make you stink in the process. Selenium is a other nonmetal element. Some selenium compounds decolourise glass, while others give a deep red colour. 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. Each entry has a full citation identifying its source. A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. Atomic number (number of protons in the nucleus): 34 2. Sign with atomic number and atomic weight. It is indicated by the symbol Se and the atomic number of selenium is 34. Atomic Mass of Selenium Yum! https://www.nuclear-power.net/Selenium-atomic-number-mass-density Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 … Some elements exist in several different structural forms, called allotropes. Selenium trioxide (SeO 3) Interesting facts: It is similar to sulfur in its form and compounds. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. Selenium is a non-metal and was discovered in 1817. Isotopes of an element are atoms that have the same atomic numbers but a different number of neutrons (different mass numbers) in their nuclei. The image is of a crescent moon against a cratered surface. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. Period Chemical element of periodic table. 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. The mass of an atom relative to that of carbon-12. It converts light into electricity. It is given by the ratio of the pressure on a body to the fractional decrease in volume. Half of the distance between two atoms within a single covalent bond. Group It is located in Group 16 of the periodic table. Butyl seleno mercaptan is the essential ingredient of skunk smell, and is certainly a contender for the title of the worst smelling compound. High = substitution not possible or very difficult. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Our selenium page has over 260 facts that span 106 different quantities. Classified as a nonmetal, Selenium is a solid at room temperature. 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. it exists in the form of ores and minerals. The sum of the oxidation states within a compound or ion must equal the overall charge. Elements are organised into blocks by the orbital type in which the outer electrons are found. 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. But what is an "Atomic Number"? Selenium is an element of group VIA and period 4 of the periodic table with Atomic Number Z=34 and Mass Number A=78.96 [1]. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. 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". 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. Its chemical symbol is Se and its atomic number is 34. Chemical symbol for Selenium is Se. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Selenium boiling point is 685 °C. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. Please enable JavaScript to access the full features of the site. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. UNII-CPT0VS6XYI. at 0℃ and one atmosphere pressure. Element Classification: Non-metal. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The melting point of selenium is 494 degrees Kelvin or 221.85 degrees Celsius or degrees Celsius. Selenium is a chemical element with symbol Se and atomic number 34. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. Atomic radius, non-bonded From: Analytica Chimica Acta, 2013 Related terms: Trivial name of Selenium is chalcogens*. 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. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Covalent radiusHalf of the distance between two atoms within a single covalent bond. Selenium – Atomic Mass – Atomic Weight – Se 2020-11-21 by Nick Connor Atomic Mass of Selenium Atomic mass of Selenium is 78.96 u. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. Selenium (Se). 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. Atomic Weight: 78.971. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. It is toxic in high amount but is an essential micronutrient for all living things. Molecule And Communication Background. This is a list of the 118 chemical elements which have been identified as of 2021. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. Selenium (Se) is a grey non metal that can also exist as a red allotrope. The percentage of an element produced in the top producing country. Selenium is a chemical element with symbol Se and atomic number 34. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Here are the properties of selenium, according to the Jefferson Lab: 1. Symbol: Se; atomic weight: 78.96; atomic number: 34; specific gravity: (gray) 4.80 at 25°C, (red) 4.50 at 25°C. It is also used as a catalyst in some chemical processes. Some elements exist in several different structural forms, called allotropes. The temperature at which the solid–liquid phase change occurs. — In-game description Selenium is a Raw Material introduced in v2.0. That was Cambridge University's Bernie Bulkin with the story of Selenium. Selenium was discovered by Jöns Jacob Berzelius (SE) in 1817. History and Discovery . The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Similar Illustrations See All. Selenium is an element of group VIA and period 4 of the periodic table with Atomic Number Z=34 and Mass Number A=78.96 [1]. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. A horizontal row in the periodic table. The arrangements of electrons above the last (closed shell) noble gas. This chemical element can be found in two forms: a red color powder or light grey color metal. Aloha Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. 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 transition of a substance directly from the solid to the gas phase without passing through a liquid phase. 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. Selenium is a chemical element with atomic number 34 and symbol Se. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Selenium burns in air and is toxic by inhalation or ingestion. Where more than one isotope exists, the value given is the abundance weighted average. The nucleus consists of 34 protons (red) and 46 neutrons (blue). The higher the value, the larger risk there is to supply. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Copyright of and ownership in the Images reside with Murray Robertson. 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. 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. Electron configuration This is approximately the sum of the number of protons and neutrons in the nucleus. A measure of how difficult it is to compress a substance. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). It has the atomic number 34 in the periodic table. For a wider selection of images connected with Selenium, see Category:Selenium. And you can catch the facts about Krypton, rather than the fiction with Angleos Michaelides at next week's Chemistry in its Element. Uncombined elements have an oxidation state of 0. Data for this section been provided by the. The boiling point of selenium is 957.8 degrees Kelvin or 685.65 degrees Celsius or degrees Celsius. 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. Most important, so called gray selenium consists of long chains of atoms forming extended helical structures. Its primary use is in alloys and in glass production. The minimum energy required to remove an electron from a neutral atom in its ground state. It was first observed by the Swedish scientist Jons Jacob Berzelius. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. The name is derived from 'selene', the Greek name for the Moon. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. 2 Names and Identifiers Expand this section. It decreases electrical resistance with increased illumination. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. The element occurs in copper ores and rare minerals … High = substitution not possible or very difficult. So much for trying to do a "wikipedia" search for this "hidden" element! Each allotrope has different physical properties. It is found in several forms, but is usually prepared with a crystalline structure. It is a micronutrient. Periodic Table of the. What's in a name? Atomic symbol (on the Periodic Table of Elements): Se 3. Create . Allotropes Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Selenium Se chemical element. Selenium is a chemical element with atomic number 34 and symbol Se. 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. It has 34 protons and 34 electrons and a mass number of 78.96. Name: Selenium Symbol: Se Atomic Number: 34 Atomic Mass: 78.96 amu Melting Point: 217.0 °C (490.15 K, 422.6 °F) Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F) Number of Protons/Electrons: 34 Number of Neutrons: 45 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 4.79 g/cm 3 Color: gray Atomic Structure The atomic number of each element increases by one, reading from left to right. 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. Dates: Modify . Selenium chemical element. Every atom has an atomic number, even Selenium. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Se is a non-metal. But it's not all bad news. The number of atoms of the element per 1 million atoms of the Earth’s crust. Atomic Number of Selenium is 34. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. 2005-08-08. The atomic number of selenium is 34. Classified as a nonmetal, Selenium is a solid at room temperature. Boiling point: 1,265 F (685 C) 8. Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of selenium-79 (atomic number: 34), an isotope of this element. Each allotrope has different physical properties. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Period Number: 4. Selenium (selenium atoms only) has several different forms. Political stability of top reserve holder. Atomic Number 34 Learn more about the atomic number. 4 Related Records Expand this section. Selenium is found in a few rare minerals. 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. Selenium chemical element. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Again, this requires great care. Atomic Number: 34: Atomic Mass: 78.96 atomic mass units Number of Protons: 34: Number of Neutrons: 45: Number of Electrons: 34: Melting Point: 217.0° C: Boiling Point : 684.9° C: Density: 4.79 grams per cubic centimeter: Normal Phase: Solid: Family: Nonmetals: Period: 4: Costs: $300 per pound . Illustration about electron, mendeleev - 151780818 Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. Melting point: 429 degrees Fahrenheit (220.5 degrees Celsius) 7. Boiling point We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. 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. The temperature at which the liquid–gas phase change occurs. The biggest use of selenium is as an additive to glass. 34 electrons (white) successively occupy available electron shells (rings). The RSC maintains this Site for your information, education, communication, and personal entertainment. 96}, author={D. T. Win} } D. T. Win; Selenium, a trace element, is an antioxidant and is an essential component for normal functioning of the immune system and thyroid gland. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. A measure of how difficult it is to deform a material. Elements are organised into blocks by the orbital type in which the outer electrons are found. The availability of suitable substitutes for a given commodity. Molecule And Communication Background. Un préfixe (Nouveau mot formé en ajoutant une ou plusieurs lettres devant le mot.) 2020-12-26. Isotopes Molecule And Communication Background. Contents . A horizontal row in the periodic table. Chemical element of periodic table. Medium = substitution is possible but there may be an economic and/or performance impact 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. Généralité sur l'élément et histoire. Selenium Overview . It can also convert AC electricity to DC electricity, so is extensively used in rectifiers. Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it a bronze tint. The chemical symbol for selenium is Se. 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. Selenium's Melting Point is 429.5F. The origin of the name comes from the Greek word selene meaning moon. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Density is the mass of a substance that would fill 1 cm3 at room temperature. 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 element symbol of selenium is Se. CPT0VS6XYI. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. The atomic number of each element increases by one, reading from left to right. It can be also added as catalyst and as electricity convertor in rectifiers. Where the element is most commonly found in nature, and how it is sourced commercially. Members of a group typically have similar properties and electron configurations in their outer shell. Atomic weight (average mass of the atom): 78.96 4. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. The nucleus consists of 34 protons (red) and 46 neutrons (blue). Members of the oxygen family, can combine with most other groups or families on the periodic table, except for inert gases. The percentage of the world reserves located in the country with the largest reserves. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S Selenium has atomic number 34, meaning each atom has 34 protons. Sublimation 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. Atoms of the same element with different numbers of neutrons. Atomic Number Selenium. 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. 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. This is where the artist explains his interpretation of the element and the science behind the picture. But I save the best occurrence of selenium in nature for last. It can convert AC electricity to DC electricity. 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. Ok so I'll take you through some interesting facts and data about Selenium (That most people don't know). You do not have JavaScript enabled. The colour ranges from grey metallic to red glassy. Atoms of the same element with different numbers of neutrons. In the human body, selenium content ranges betwe… 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. 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. Connected lines with dots. Selenium symbol. 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. Atomic number It is therefore useful in photocells, solar cells and photocopiers. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. It is defined as being the charge that an atom would have if all bonds were ionic.