Selenium

Facts about Selenium **:** **By: Megan Wynn**


 * Symbol: SE
 * Atomic Number: 34[[image:http://periodictable.com/Samples/034.12/s9s.JPG width="257" height="258" align="right"]]
 * Atomic Mass: 78.96


 * # of Protons: 34
 * # of Neutrons: 45
 * # of Electrons: 34


 * Melting Point: 217.0 degrees celcius
 * Pure Cost = $61 for 100g
 * Bulk Cost = $5.30 for 100g
 * Classification: non-metal

This element belongs to the oxygen/chalcogenides family. The name Selenium originates from the Greek word 'selene', meaning moon. It was discovered by Jacob Berzely in 1817. Selenium is a solid. It is used for: TV's, cameras, xerography, and photographic equipment. It is also used in the glass indsutry to de-colorize glass and to make red-colored glasses and enamels. It has potential to be toxic if taken in excess. Red in power form, black in vitreous form, and metallic gray in crystalline form. It's often found in nature, but more often occurs as selenides of iron, lead, silver, or copper.