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 is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Selene was the Greek goddess of the moon. Selenium (atomic number 32, symbol Se) is a nonmetal and a chemical element that is added to dietary supplements and is an essential mineral. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Our selenium page has over 260 facts that span 106 different quantities. Period Number: 4. Selenium burns in air and is toxic by inhalation or ingestion. Its electronic configuration is 1s. Selenium is a chemical element with atomic number 34 and symbol Se. Compounds containing selenium in the -2 oxidation state are called selenides. Quiz: Test your new selenium knowledge with the Selenium Facts Quiz. 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. 34 Se Selenium 78.971. Element Classification: Non-metal. According to Pauling scale, its electronegativity is 2.55. Selenium is also used as an additive to stainless steel. Atomic mass of Selenium is 78.96 u. The nucleus consists of 34 protons (red) and 46 neutrons (blue). Isotopes: Selenium has 29 known isotopes including Se-65, Se-67 to Se-94. Melting point 494K. 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 is found in several forms, but is usually prepared with a crystalline structure. Now a days, the selenium compound (selenium sulfide) is widely used for the treatment of dandruff. Jons Jacob Berzelius and isolated by Johann Gottlieb Gahn, 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or [Ar] 3d10 4s2 4p4. Atomic Weight: 78.971. It has the atomic number 34 in the periodic table. Symbol: Se; atomic weight: 78.96; atomic number: 34; specific gravity: (gray) 4.80 at 25°C, (red) 4.50 at 25°C. Number of protons in Selenium is 34. 34 Se Selenium 78.971. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Selenium has atomic number 34, meaning each atom has 34 protons. Symbol of the selenium element is Se. Selenium deficiency may cause Kashin – beck disease, stress, low functioning of brain, white muscle disease in ruminants, dysfunction of thyroid gland etc. Atomic Mass of Polonium. It is used in flat panel x – ray detectors. It is widely used in glassmaking and pigmentation. Selenium is used in various fields mainly due to its properties such as photoconductivity, semiconductor of electricity etc. Each entry has a full citation identifying its source. It shows similar properties as sulfur, tellurium, and arsenic. The element symbol of selenium is Se. Selenium (Se) is a grey non metal that can also exist as a red allotrope. Selenium is also a photoconductor. High amount of selenium is also present in oceans . Se is a non-metal. Selenium is a chemical element.Its chemical symbol is Se and its atomic number is 34. For commercial use selenium is mostly produced as a byproduct of refining of metal sulfide ores. Symbol of the selenium element is Se. It has been found in research that its conductivity increases in presence of light which means its photoconductivity increases as the intensity of light increases. Its 7 isotopes are available in nature. It is located in Group 16 of the periodic table. The word selenium is derived from the Greek word ‘. It is used in the glass industry to make ruby-red colored glasses and enamels and to decolorize glass. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. It has been found in research that its conductivity increases in presence of light which means its photoconductivity increases as the intensity of light increases. It is used in photocells as it is a photoconductor. Arsenic is found at the left of selenium in the 4th period and 15. group. Collected on planet surfaces and from asteroids.Selenium, Se, atomic number 34. Symbol of the selenium element is Se. Phase at Room Temperature: Solid. Selenium is used in anti-dandruff shampoos. . Its 5 isotopes are stable which are 74Se, 76Se, 77Se, 78Se, 80Se. Selenium has atomic number 34, meaning each atom has 34 protons. What's in a name? Group Number: 16. Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Selenium was discovered by Jöns Jacob Berzelius (SE) in 1817. It has 34 protons and 34 electrons and a mass number of 78.96. 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. By doing so, you will be able to access free PDFs of NCERT Solutions as well as Revision notes, Mock Tests and much more. However, hydrogen selenide (H2Se) and other selenium compounds are extremely toxic, resembling arsenic in their physiological reactions. Atomic Number of Selenium. The element occurs in copper ores and rare minerals … Vedantu academic counsellor will be calling you shortly for your Online Counselling session. Elemental selenium is fairly nontoxic and is considered an essential trace element for proper nutrition. Selenium conducts some amount of electricity. en: Selenium – de ... chemical element with symbol Se and atomic number 34. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … — In-game description Selenium is a Raw Material introduced in v2.0. Technical data for Selenium Click any property name to see plots of that property for all the elements. Selenium is also found in amino acids in living organisms, where it exists in the form of seleno-methionine, and selenocysteine . Generally required or necessary amounts of selenium is consumed by animals and humans through food, but more amount of selenium is consumed by them through its accumulation in the environment. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Selenium occurs in some soils in amounts sufficient to produce serious effects on animals feeding on plants grown from those soils (e.g., locoweed). Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive action, where electrical resistance decreases with increased illumination. Because it can convert AC electricity to DC, it is widely used in rectifiers. 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 is a nonmetallic element with an atomic number of 34 and an atomic weight of 78.96. Tellurites precipitate out of solution, leaving selenous acid, H2SeO3n. By using ThoughtCo, you accept our, Periodic Table of Elements: Thorium Facts, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College, Jöns Jakob Berzelius found a red sulfur-like deposit at a sulfuric acid manufacturing facility. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 Reference E95 As it is found in the 16th group so, it is a p – block element. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. 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. Atomic Number – Protons, Electrons and Neutrons in Selenium. Se is a non-metal. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. Selenium is found as red, grey and black allotropes of it. International Atomic Energy Agency ENSDF database (Oct 2010). Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S Atomic mass of Selenium is 78.96 u. Selenium enters the environment as selenium dioxide through combustion of coal and oils. It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – shell and 6 electrons in its outermost shell N. Physical and Chemical Properties of Selenium are Listed Below, It has many isotopes. It can change light energy into electrical energy. As it is found in the 16th group so, it is a p – block element. Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, silver, or lead. Crystalline monoclinic selenium is deep red; crystalline hexagonal selenium, the most stable variety, is gray with a metallic luster. We hope you enjoyed learning and were able to grasp the concepts. 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. Atomic Number of Polonium. Group Name: Chalcogen. We hope after reading this article you will be able to solve problems based on the topic. It is used in fluorescent quantum dot and surge protectors. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Sources: Selenium occurs in the minerals crooksite and clausthalite. In the past selenium used to dominate the electronics market as it is a semiconductor but presently silicon has almost replaced selenium. Pro Lite, Vedantu Arsenic is found at the left of selenium in the 4th period and 15th group. References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.) It was first observed by the Swedish scientist Jons Jacob Berzelius. It is used to make alloys. It can convert AC electricity to DC electricity. Selenium is a p-type semiconductor below its melting point, which leads to many solid-state and electronics applications. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. The origin of the name comes from the Greek word selene meaning moon. Selenium was discovered and isolated by Swedish Chemists Jons Jacob Berzelius and Johann Gottlieb Gahn in 1817. A combination of bismuth and selenium can be used to replace the more toxic lead in many brass alloys. What's in a name? Atomic mass of Polonium is 209 u.. Atomic Number: 34. Atomic Number of Selenium is 34.. Chemical symbol for Selenium is Se. It has the symbol Se. Its 5 isotopes are stable which are. Selenium (Se). Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. It is indicated by the symbol Se and the atomic number of selenium is 34. Such as in brasses selenium is used in place of lead which is more toxic than selenium. Overexposure of selenium may cause bronchitis, asthma, vomiting, lungs dysfunction, diarrhea, abdominal pain, shortness of breath and in severe cases death. Period Number: 4. 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. 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. Selene was the Greek goddess of the moon. Selenium Atomic Number and Electronic Configuration, Atomic number of selenium is 34. He originally thought the deposit was. The most common ore of selenium are the sulfide ores. There are six stable isotopes: Se-74 (0.89% abundance), Se-76 (9.37% abundance), Se-77 (7.63% abundance), Se-78 (23.77% abundance), Se-80 (49.61% abundance) and Se-82 (8.73% abundance). It shows similar properties as sulfur, tellurium, and arsenic. 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. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Selenium gets its name from the Greek word "selene," which means "moon." Gray selenium conducts electricity better when light is shined on it. although its key isotope is 80Se. Thus, it is a semiconductor. It affects our ecosystem as well. Selenium is most commonly found in nature in its inorganic form, sodium selenite. Selenium is not an abundant element. Atomic Number: 34. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Out of seven naturally occurring isotopes, 5 are stable and two are unstable. An organic form of selenium, selenomethionine, is found in foods. Group Number: 16. It has the symbol Se. Pro Lite, Vedantu Atomic weight of Selenium is 78.971 u or g/mol. Atomic Weight: 78.971. Selenium is a chemical element with symbol Se and atomic number 34. Element Classification: Non-metal. Organoselenium compounds are used in vulcanization of rubber. Selenium is liberated from selenous acid by SO2. Atomic Number of Selenium. It is a component of many enzymes such as thioredoxin reductase, deiodinase enzymes. High concentrations of selenium may cause reproductive failures, defects in infants. Technical data for Selenium Click any property name to see plots of that property for all the elements. 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. Due to its various properties sometimes, it is considered as a metalloid as well. It decreases electrical resistance with increased illumination. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … 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. It works as an antifungal agent. Selenium is an essential trace element, but its high concentrations are harmful for the environment. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. It is generally found in metal sulfide ores. It is used in thin – film solar cells of copper indium gallium selenide. Although after research it has been said that all these effects of selenium deficiency are generally accompanied with deficiency of other vitamins or other diseases. ... What is Selenium? The chemical symbol for Selenium is Se . Selenium gets its name from the Greek word "selene," which means "moon." Sulfur is placed above selenium and tellurium is placed below selenium in the 16, group of the periodic table. Its chemical symbol is Se. One ounce of brazil nuts contain 544 micrograms of selenium or 777% the Recommended Daily Allowance. It is a nonmetal element with the atomic number 34. It is used in copper alloys as well. Selenium Description. Selenium trioxide (SeO 3) Interesting facts: It is similar to sulfur in its form and compounds. Selenium may cause cataracts, damage to liver tissues, respiratory problems etc. Phase at Room Temperature: Solid. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. It shows similar properties as sulfur, tellurium, and arsenic. Uses: Selenium is used in xerography to copy documents and in photographic toner. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Electronic Configuration of Group 17 Elements, Electronic Configuration of the d-Block Elements, An Introduction to Atomic Number, Isotopes and Isobars, Difference Between Atomic Mass and Atomic Weight, Chemical Properties of Metals and Nonmetals, Benzene - Physical and Chemical Properties, Vedantu It is located in Group 16 of the periodic table. High concentration of selenium in fishes may cause swelling of gills and blood flow within the gills. It is indicated by the symbol Se and the atomic number of selenium is 34. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Specific Heat (@20°C J/g mol): 0.321 (Se-Se). In mineral form, selenium is present in the form of selenite or selenide compounds. Selenium is a chemical element with symbol Se and atomic number 34. It converts light into electricity. ThoughtCo uses cookies to provide you with a great user experience. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure.The chemical symbol for Polonium is Po. Melting Point: 493.65 K (220.5°C or 428.9°F) Boiling Point: 958 K (685°C or 1265°F) Density: 4.809 grams per cubic centimeter. The chemical symbol for Nickel is Ni. Group Name: Chalcogen. Our selenium page has over 260 facts that span 106 different quantities. Selenium is a chemical element which is placed in the 16th group and 4, period in the periodic table. The word selenium is derived from the Greek word ‘selene’ which means moon. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. It has the atomic number 34 in the periodic table. It has been prepared from flue dusts from processing copper sulfide ores, but the anode metal from electrolytic copper refineries is a more common source of selenium. Few of its uses are listed below –. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring … Upload media Early photoelectric circuits and. These are the main commercial uses of selenium in today’s world. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. For commercial use selenium is mostly produced as a byproduct of refining of metal sulfide ores. Each entry has a full citation identifying its source. Atomic Number of Selenium. 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 Thus, it is a semiconductor. Due to its various properties sometimes, it is considered as a metalloid as well. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Its primary use is in alloys and in glass production. It is generally found in metal sulfide ores. It has many isotopes. Selenium is a toxic element and its high concentrations are not only harmful for the environment but for human health as well. She has taught science courses at the high school, college, and graduate levels. Sorry!, This page is not available for now to bookmark. Atomic number of selenium is 34. ’ which means moon. 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. Small amount of selenium salts is necessary for proper functioning of cells in many organisms. It is rarely found as pure ore or in pure elemental form. The atomic mass is the mass of an atom. It is used in photocells and light meters. Selenium-75 is used in industrial radiology as a gamma source. 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 chemical symbol for Selenium is Se.. Atomic Mass of Selenium. Sulfur is placed above selenium and tellurium is placed below selenium in the 16th group of the periodic table. This ends our coverage on the topic “Selenium”. Selenium is a chemical element which is placed in the 16th group and 4th period in the periodic table. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. The chemical symbol for Selenium is Se.. Atomic Mass of Selenium. Selenium is a chemical element which is placed in the 16th group and 4 th period in the periodic table. Selenium dioxide is used in manganese electrolysis. Apart from these it has many synthetic isotopes as well, although all of its synthetic isotopes are unstable in nature. Selenium is also a photoconductor. Classified as a nonmetal, Selenium is a solid at room temperature. ] 4s2 3d10 4p4 alkalis and nitric acid better when light is converted directly into electricity and! 78.971 u or g/mol additive to stainless steel, unaffected by water and soluble in alkalis and nitric.... Selenium conducts some amount of electricity etc selenium atomic number of selenium or 777 % the Recommended Daily Allowance Counselling... The name comes from the Greek word ‘ for selenium is a toxic element its... 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