Group Number: 16. 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. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). It can convert AC electricity to DC electricity. 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 We hope after reading this article you will be able to solve problems based on the topic. It affects our ecosystem as well. Overexposure of selenium may cause bronchitis, asthma, vomiting, lungs dysfunction, diarrhea, abdominal pain, shortness of breath and in severe cases death. Due to its various properties sometimes, it is considered as a metalloid as well. It is used in copper alloys as well. It shows similar properties as sulfur, tellurium, and arsenic. According to Pauling scale, its electronegativity is 2.55. Selenium is a chemical element which is placed in the 16th group and 4 th period in the periodic table. Brazil nuts have the highest levels of nutritional selenium. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. It is a nonmetal element with the atomic number 34. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. We hope you enjoyed learning and were able to grasp the concepts. It shows similar properties as sulfur, tellurium, and arsenic. ThoughtCo uses cookies to provide you with a great user experience. Classified as a nonmetal, Selenium is a solid at room temperature. It is indicated by the symbol Se and the atomic number of selenium is 34. It is used in flat panel x – ray detectors. Atomic mass of Selenium is 78.96 u. Selenium is used in various fields mainly due to its properties such as photoconductivity, semiconductor of electricity etc. Selenium is a chemical element which is placed in the 16th group and 4th period in the periodic table. Pro Lite, Vedantu 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. ’ which means moon. It is a component of many enzymes such as thioredoxin reductase, deiodinase enzymes. It is rarely found as pure ore or in pure elemental form. Collected on planet surfaces and from asteroids.Selenium, Se, atomic number 34. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring … It has the atomic number 34 in the periodic table. 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 deficiency may cause Kashin – beck disease, stress, low functioning of brain, white muscle disease in ruminants, dysfunction of thyroid gland etc. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. it exists in the form of ores and minerals. Symbol of the selenium element is Se. It is used in fluorescent quantum dot and surge protectors. 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. It is located in Group 16 of the periodic table. Out of seven naturally occurring isotopes, 5 are stable and two are unstable. Small amount of selenium salts is necessary for proper functioning of cells in many organisms. Selenium is a nonmetallic element with an atomic number of 34 and an atomic weight of 78.96. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. 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. The atomic mass is the mass of an atom. Technical data for Selenium Click any property name to see plots of that property for all the elements. ... What is Selenium? Jons Jacob Berzelius and isolated by Johann Gottlieb Gahn, 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or [Ar] 3d10 4s2 4p4. It is also used as a catalyst in some chemical processes. It decreases electrical resistance with increased illumination. It is rarely found as pure ore or in pure elemental form. Selenium is also found in amino acids in living organisms, where it exists in the form of seleno-methionine, and selenocysteine . The word selenium is derived from the Greek word ‘. 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. These are the main commercial uses of selenium in today’s world. High concentrations of selenium may cause reproductive failures, defects in infants. Selenium enters the environment as selenium dioxide through combustion of coal and oils. Its chemical symbol is Se. 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 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. 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