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kate green

on 11 December 2015

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Transcript of Selenium

Selenium was originally discovered by Jons Jacob Berzelius, who was a swedish chemist in 1817. It was discovered while analyzing an impurity that was contaminating sulfuric acid. Berzelius had mistaken it for Tellurium at first but soon realized otherwise.
Selenium occurs in minerals suck as Eacurite, Crooksite and Clausthalite which is a very rare source . Copper is a refining by- product commonly obtained in Selenium. Occasionally occurs free in nature but more often in iron, lead, silver and copper. Brazil nuts are richest known for a dietary source.
It's commonly used in devices that respond to the intensity of light, such as photo cells, and light meters for cameras and copiers. It's also used to make a ruby red color in glasses and enamels, as a toner and sometimes a stainless steal.
Selenium exists in several allotropic forms , the most stable form, crystalline selenium is metallic gray. Crystalline monoclinic is a deep red in powder but black in vitreous forms.
Selenium has an atomic # of 34, and an average atomic mass of 79. It has 34 electrons, 34 protons and 46 neutrons. It currently has about 6 stable isotopes. Selenium is a greek word for moon, Selene. It's located on row 4, and group 16.
Selenium (Se)
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