Selenium


 * Selenium **



 Basic Information Name of element: Selenium How it got its name? : Selenium got its name from its grayish sliver color and its name is from the Greek word selune meaning moon it is also in contrast to the similar element Tellure Selenium was discovered by Jöns Jacob Berzelius, a Swedish chemist, in 1817 Symbol: Se ( first two letters in name) Atomic Number: 34 Atomic Mass: 78.96 # of protons: 34 # of electrons: 34 # of neutrons: 45 Where is it found? It is found in small traces around us In what state is it found? Solid\ Melting point: 217 degrees celcius Boiling point: 684.9 degrees celcius Abundance on Earth: 50 parts per billion <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Density: 4.79 g/cm 3 <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Information from various websites(see bottom Sources section)

<span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Uses: <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">According to <span style="font-family: Arial,Helvetica,sans-serif;">[]
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Uses of Selenium: Selenium exhibits both photovoltaic action, where light is converted directly into electricity, and photoconductive action, where the electrical resistance decreases with increased illumination. These properties make selenium useful in the production of photocells and exposure meters for photographic use, as well as solar cells.
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Selenium is also able to convert a.c. electricity to d.c., and is extensively used in rectifiers
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">useful in electronic and solid-state applications
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">used in photocopying for reproducing and copying documents, letters, etc.
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">used by the glass industry to decolourise glass and to make ruby coloured glasses and enamel
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">additive for stainless steel
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Also used in the making of
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">TV camera
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Xerography
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">Photographic equipment
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">The largest use of selenium worldwide is in glass and ceramic manufacturing, where it is used to
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">give a red color to glasses, enamels and glazes as well as to remove color from glass by counteracting the green tint imparted by impurities.
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;">photographic toner[[image:selenium.jpg width="274" height="173" align="right"]]

<span style="color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 120%;"> Facts > <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Selenium is also considered an antioxidant <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">According to <span style="font-family: Arial,Helvetica,sans-serif;">[|http://periodic.lanl.gov/elements/34.html 12-15-11]
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Cost is $300 per pound
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">body only needs small amounts of it to function properly. Selenium plays an important role in the body's enzyme function
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Good sources of selenium from foods include:
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Fish and shellfish
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Red meat, chicken and liver
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Grains
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Eggs
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Garlic
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Brewer's yeast and wheat germ
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">In Brazilian nuts
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Selenium is found in economic quantities in sulfide ores such as pyrite
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">AIDS appears to involve a slow and progressive decline in levels of selenium in the body
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Several studies have suggested a possible link between cancer and selenium deficiency.[ One study, known as the NPC, was conducted to test the effect of selenium supplementation on the recurrence of skin cancers on selenium-deficient men. It did not demonstrate a reduced rate of recurrence of skin cancers, but did show a reduced occurrence of total cancers, although without a statistically significant change in overall mortality.[
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">largest use of selenium worldwide is in glass and ceramic manufacturing, where it is used to give a red color to glasses, enamels and glazes as well as to remove color from glass by counteracting the green tint imparted by ferrous impurities.
 * <span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Selenium is used with bismuth in brasses to replace more toxic lead.

<span style="background-color: #000000; color: #00ffff; font-family: Arial,Helvetica,sans-serif; font-size: 110%;">Sources

<span style="font-family: Arial,Helvetica,sans-serif;">[] Steve Gagnon. 2-23-11 Jefferson Lab

<span style="font-family: Arial,Helvetica,sans-serif;">[|http://periodic.lanl.gov/elements/34.html 12-15-11] University of California Los Alamos Labs US Dept. of Energy <span style="font-family: Arial,Helvetica,sans-serif;">http://www.chemicool.com/elements/selenium.html 2-23-11

<span style="font-family: Arial,Helvetica,sans-serif;">[] Bentor, Yinon. Chemical Element.com - Selenium. Feb. 24, 2011 <http://www.chemicalelements.com/elements/se.html>.

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