Selenium


 * Element Name:** Selenium


 * Element Symbol:** Se


 * Atomic Mass:** 79[[image:Selenium.png width="215" height="287" align="right"]]


 * Atomic Number:** 34


 * Protons:** 34


 * Electrons:** 34


 * Discovery:(who & when)** In 1817 by Jons Jakob Benzelus


 * How it was named:** Greek goddess Selene; Goddess of moon


 * What is its state of matter?:** Sold


 * Melting Point: 221 ° C**
 * Boiling Point:** 685 ° C

is extremley toxic.
 * Three characteristics:** Crystalline monocline Selenium is deep red. Crystalline Hexagonal Selenium is metallic grey. H2Se


 * The use of Selenium:**

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