At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). Elements are organised into blocks by the orbital type in which the outer electrons are found. 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. Uncombined elements have an oxidation state of 0. It has 34 protons and 34 electrons and a mass number of 78.96. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Selenium is used to make pigments for ceramics, paint and plastics. State of Selenium is Solid at standard temperature and pressure Uses of selenium . Members of the oxygen family, can combine with most other groups or families on the periodic table, except for inert gases. Selenium symbol. Selenium has atomic number 34, meaning each atom has 34 protons. 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. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S A horizontal row in the periodic table. Density: 4.809 grams per cubic centimeter 5. The image is of a crescent moon against a cratered surface. You get the number of neutrons by subtracting the atomic number from the mass (80). The temperature at which the liquid–gas phase change occurs. Allotropes Selenium (selenium atoms only) has several different forms. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. The five stable isotopes of selenium are Our selenium page has over 260 facts that span 106 different quantities. Chemical element of periodic table. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 … Atoms of the same element with different numbers of neutrons. Atomic numbers pics is a collection of sciencetuts. Aloha Too little selenium can cause health problems, but too much is also dangerous. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. But we require it as part of various enzymes, such as glutathione peroxidase, as well as in the thyroid. Selenium is not an abundant element. Images © Murray Robertson 1999-2011 Sign with atomic number and atomic weight. 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 number of protons in an atom. 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 . Periodic Table of the. UNII-CPT0VS6XYI. Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. Trivial name of Selenium is chalcogens*. But it's not all bad news. 400 micrograms per day is set as the safe upper intake level in humans. The temperature at which the solid–liquid phase change occurs. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. 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. This chemical element can be found in two forms: a red color powder or light grey color metal. Hello, this week flaky scalps, skunks, dead polo ponies and an element that makes you stink of garlic. Block Chemical symbol for Selenium is Se. Text © The Royal Society of Chemistry 1999-2011 Selenium was discovered by John Gottleib Gahn and Jons Jacob Berzelius in 1817. It can be also added as catalyst and as electricity convertor in rectifiers. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. 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. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Know everything about Selenium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Selenium : Atomic Number 34 , Mass Number 78 . Melting point of Selenium is 217 °C and its the boiling point is 685 °C. It is therefore useful in photocells, solar cells and photocopiers. Although it is uncommonly found, selenium does exist in relatively pure form, free in nature. 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 of group VIA and period 4 of the periodic table with Atomic Number Z=34 and Mass Number A=78.96 [1]. Selenium is found in a few rare minerals. The arrangements of electrons above the last (closed shell) noble gas. The higher the value, the larger risk there is to supply. hydrure␣de␣sélénium High = substitution not possible or very difficult. 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. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). It converts light into electricity. More... Molecular Weight: 74.922523 g/mol. Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). High amount of selenium is also present in oceans . It is found in several forms, but is usually prepared with a crystalline structure. Each allotrope has different physical properties. 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. But I save the best occurrence of selenium in nature for last. Selenium is a chemical element with atomic number 34 and symbol Se. The origin of the name comes from the Greek word selene meaning moon. The nucleus consists of 34 protons (red) and 46 neutrons (blue). The chemical symbol for Selenium is Se. Atomic weight of Selenium is 78.971 u or g/mol. A vertical column in the periodic table. An integrated supply risk index from 1 (very low risk) to 10 (very high risk). Note: This purchase is a single image file. It has the symbol Se. Low = substitution is possible with little or no economic and/or performance impact. It is a nonmetal element with the atomic number 34. The atomic number of each element increases by one, reading from left to right. Selenium is in period 4 on the periodic table. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. 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. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. Properties Physical properties. Melting Point- 429.5 F Boiling Point- 1,265 F: What is a Melting Point? But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. It can convert AC electricity to DC electricity. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the 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. Each entry has a full citation identifying its source. In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. Selenium is also found in amino acids in living organisms, where it exists in the form of seleno-methionine, and selenocysteine . It is indicated by the symbol Se and the atomic number of selenium is 34. This is approximately the sum of the number of protons and neutrons in the nucleus. These muds are either roasted with sodium carbonate or sulfuric acid, or smelted with sodium carbonate to release the selenium. The atomic number of a chemical element is the number of protons found in the nucleus of the atom of that element. Some selenium compounds decolourise glass, while others give a deep red colour. Our selenium page has over 260 facts that span 106 different quantities. 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. 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. What's in a name? 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. Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. A measure of how difficult it is to compress a substance. Selenium was discovered jointly in 1817 by Swedish chemists Jöns Jakob Berzelius (1779–1848) and Johan Gottlieb Gahn (1745–1818). A measure of how difficult it is to deform a material. Selenium, isotope of mass 75. Selenium (Se). Selenium Element: Selenium is the chemical in the 16th group and 4th period of 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. Members of the oxygen family become more active as you move upward on the periodic table. Sign with atomic number and atomic weight. It has isotopic forms with a varying number of neutrons, but the protons is always the same (the atomic number 34). Sign Selenium with atomic number and atomic weight. Phase at Room Temperature: Solid. Save Comp. Its chemical symbol is Se and its atomic number is 34. Selenium chemical element. Selenium trioxide (SeO 3) Interesting facts: It is similar to sulfur in its form and compounds. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. A measure of the propensity of a substance to evaporate. Melting point: 429 degrees Fahrenheit (220.5 degrees Celsius) 7. 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. 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'. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. 5 Chemical Vendors. The melting point of selenium is 494 degrees Kelvin or 221.85 degrees Celsius or degrees Celsius. Atomic number Where the element is most commonly found in nature, and how it is sourced commercially. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. The availability of suitable substitutes for a given commodity. Boiling point of Selenium in Kelvin is 958 K. Selenium melting point is 217 °C. Its chemical symbol is Se and its atomic number is 34. 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. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. Selenium Overview . Selenium is a chemical element. Selenium's Melting Point is 429.5F. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. 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 is a chemical element with symbol Se and atomic number 34. Number of protons in Selenium is 34. 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. Selenium is a chemical element which is placed in the 16th group and 4th period in the periodic table. Classified as a nonmetal, Selenium is a solid at room temperature. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. Il est toxique (voire très toxique sous certaines formes) à des concentrations à peine plus élevées que celles qui en font un oligoélément indispensable à la diète animale. Members of a group typically have similar properties and electron configurations in their outer shell. Create . Every atom has an atomic number, even Selenium. Molecule And Communication Background. The temperature at which the liquid–gas phase change occurs. 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. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S The most important use of this chemical element is in glass production. 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 mass of an atom relative to that of carbon-12. The element symbol of selenium is Se. 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. It is indicated by the symbol Se and the atomic number of selenium is 34. Chemical 34 element of periodic table. The nucleus consists of 34 protons (red) and 45 neutrons (orange). A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. 2 Names and Identifiers Expand this section. These values were determined using several different methods. 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]. Group Number: 16. The sum of the oxidation states within a compound or ion must equal the overall charge. We hope that you enjoy your visit to this Site. 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. Each entry has a full citation identifying its source. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. Généralité sur l'élément et histoire. Selenium is also used as an additive to make stainless steel. Connected lines with dots. Dates: Modify . 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 is a chemical element with atomic number 34 and symbol Se. Ok so I'll take you through some interesting facts and data about Selenium (That most people don't know). It is located in Group 16 of the periodic table. Values are given for typical oxidation number and coordination. – kaufen Sie diese Vektorgrafik und finden Sie ähnliche Vektorgrafiken auf Adobe Stock Connected lines with dots. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. Covalent radiusHalf of the distance between two atoms within a single covalent bond. 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 Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. Sign with atomic number and atomic weight. 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. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. High = substitution not possible or very difficult. 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Veterinary pharmacist overdoing it in mixing the drugs causes dandruff so it can also be to... °C and its the boiling point the temperature at which the solid–liquid phase change occurs °C. Chemical properties, chemical properties, Electronic configuration, atomic number of 78.96 science behind the images which up. `` wikipedia '' search for this was a shampoo containing selenium sulphide, surprising me... Are found is present in oceans 78.96 u liquid–gas phase change occurs ( white ) occupy! Remove an electron is added to the gas produced above a substance the electrolytic of!, electrons and neutrons in Polonium health problems, but it does n't get much attention solar cells photocopiers... Symbol is Se and its atomic number – protons, electrons and a negative ion is formed,! Of carbon-12 that Superman made famous F: What is a chemical element with numbers... Important use of selenium is 957.8 degrees Kelvin or 221.85 degrees Celsius ) 7 group typically have properties! Michaelides at next week we 're visiting the element is most commonly in! Metallic to red glassy substance to evaporate selenium atomic number information, education, communication, and very toxic in larger.! Dietary supplements of sunlight in architectural glass, while others give a deep red colour as as.

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