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| rdfs:comment | - Selenium was a substance that could be used in the composition of drives of BB-series astromech droids. When Kylo Ren pressed Rey for details about the droid known as BB-8, she listed technical specifications such as a selenium drive, evading the real focus of Ren's inquiry: the map to Luke Skywalker that the droid contained.
- Selenium (symbol Se) is a chemical element, with atomic number 34 on the periodic table.
- Selenium has a variety of functions. The main one is its role as an antioxidant in the enzyme selenium-glutathione-peroxidase. This enzyme neutralizes hydrogen peroxide, which is produced by some cell processes and would otherwise damage cell.
- Selenium is a chemical element with the atomic number 34, and is represented by the chemical symbol Se, and has an atomic mass of 78.96. It is a nonmetal.
- Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. It rarely occurs in its elemental state in nature, or as pure ore compounds. Selenium (Greek σελήνη selene meaning "Moon") was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously known tellurium (named for the Earth).
- Selenium was a non-metallic element found at position 34 in the periodic table. It bore some resemblance to sulfur. A gas giant investigated by the Enterprise in 2152 had many moons with atmospheres containing selenium isotopes. These isotopes interfered with sensors, hampering the search for Charles Tucker when his shuttlepod was shot down over one of the moons. (ENT: "Dawn")
- Isolated selenium occurs in several different forms, the most stable of which is a dense purplish-gray semi-metal (semiconductor) form that is structurally a trigonal polymer chain. It conducts electricity better in the light than in the dark, and is used in photocells (see allotropes section below). Selenium also exists in many non-conductive forms: a black glass-like allotrope, as well as several red crystalline forms built of eight-membered ring molecules, like its lighter chemical cousin sulfur. Selenium is a common byproduct of copper refining, or the production of sulfuric acid.
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| discoverer | - Jöns Jakob Berzelius and Johann Gottlieb Gahn
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| Caption | - Fire diamond for elemental selenium
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| Title | - File: 3-icon.pngFile: 4-icon.pngSelenium
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| ImageCaption | - Selenium occurs in pure form in nature. This native selenium is exactly as it came out of the ground. It is used in many light-sensing applications: photocopiers, automatic light switches and light meters
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| abstract | - Selenium was a substance that could be used in the composition of drives of BB-series astromech droids. When Kylo Ren pressed Rey for details about the droid known as BB-8, she listed technical specifications such as a selenium drive, evading the real focus of Ren's inquiry: the map to Luke Skywalker that the droid contained.
- Selenium (symbol Se) is a chemical element, with atomic number 34 on the periodic table.
- Selenium has a variety of functions. The main one is its role as an antioxidant in the enzyme selenium-glutathione-peroxidase. This enzyme neutralizes hydrogen peroxide, which is produced by some cell processes and would otherwise damage cell.
- Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. It rarely occurs in its elemental state in nature, or as pure ore compounds. Selenium (Greek σελήνη selene meaning "Moon") was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously known tellurium (named for the Earth). Selenium is found impurely in metal sulfide ores, copper where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known, but are rare. The chief commercial uses for selenium today are in glassmaking and in pigments. Selenium is a semiconductor and is used in photocells. Uses in electronics, once important, have been mostly supplanted by silicon semiconductor devices. Selenium continues to be used in a few types of DC power surge protectors and one type of fluorescent quantum dot. Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals, and is an ingredient in many multi-vitamins and other dietary supplements, including infant formula. Selenium is a component of the antioxidant enzymes glutathione peroxidase and thioredoxin reductase (which indirectly reduce certain oxidized molecules in animals and some plants). It is also found in three deiodinase enzymes, which convert one thyroid hormone to another. Selenium requirements in plants differ by species, with some plants requiring relatively large amounts, and others apparently requiring none.
- Isolated selenium occurs in several different forms, the most stable of which is a dense purplish-gray semi-metal (semiconductor) form that is structurally a trigonal polymer chain. It conducts electricity better in the light than in the dark, and is used in photocells (see allotropes section below). Selenium also exists in many non-conductive forms: a black glass-like allotrope, as well as several red crystalline forms built of eight-membered ring molecules, like its lighter chemical cousin sulfur. Selenium is found in economic quantities in sulfide ores such as pyrite, partially replacing the sulfur in the ore matrix. Minerals that are selenide or selenate compounds are also known, but all are rare. Selenium is a common byproduct of copper refining, or the production of sulfuric acid. Isolation of selenium is often complicated by the presence of other compounds and elements. Commonly, production begins by oxidation with sodium carbonate to produce selenium dioxide. The selenium dioxide is then mixed with water producing selenous acid. The selenous acid is finally bubbled with sulfur dioxide producing elemental red amorphous selenium. Selenium produced in chemical reactions invariably appears as the amorphous red form--an insoluble, brick-red powder. When this form is rapidly melted, it forms the black, vitreous form which is usually sold industrially as beads. The most thermodynamically stable and dense form of selenium is the electrically conductive gray (trigonal) form, which is composed of long helical chains of selenium atoms. The conductivity of this form is notably light sensitive. Selenium also exists in three different deep-red crystalline monoclinic forms, which are composed of Se8 molecules, similar to many allotropes of sulfur.
- Selenium is a chemical element with the atomic number 34, and is represented by the chemical symbol Se, and has an atomic mass of 78.96. It is a nonmetal.
- Selenium was a non-metallic element found at position 34 in the periodic table. It bore some resemblance to sulfur. A gas giant investigated by the Enterprise in 2152 had many moons with atmospheres containing selenium isotopes. These isotopes interfered with sensors, hampering the search for Charles Tucker when his shuttlepod was shot down over one of the moons. (ENT: "Dawn") In 2367, Jean-Luc Picard, Wesley Crusher, and Dirgo crash landed on Lambda Paz, where they encountered an energy sentry guarding a fountain of water. The sentry neutralized threats to the fountain by encasing it in electrically deposited selenium fibers. Dirgo was killed by the sentry in this manner. (TNG: "Final Mission" ) In 2373, Michael Eddington of the Maquis combined large quantities of selenium with rhodium nitrite to produce cobalt diselenide, a poison deadly to the Cardassian nervous system. Eddington released this biogenic weapon on the Cardassian colonies of Veloz Prime and Quatal Prime in the Demilitarized Zone. (DS9: "For the Uniform")
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