Selenium


 * Element Name:** Selenium


 * Element Symbol**: Se


 * Atomic Mass:** 79[[image:Selenium_robert.png width="216" height="288" align="right"]][[image:selenium.gif width="288" height="216" align="right"]]


 * Atomic Number:** 34


 * Protons:** 34


 * Electrons:** 34


 * Discovery:** Jons Jacob Berzelius found Selenuim in 1817.


 * How was it Named:** Selenium was named from the greek word for the moon Selene.


 * State of Matter:** Solid


 * Melting Point:** 221°C


 * Boiling Point:** 685°C


 * Characteristics:** It is a purplish-gray semi-metal, hard like a rock, and it has a funny odor.


 * Uses of Element:** Selenium useful in devices that respond to the intensity of light such as electric eyes, photo cells, light meters for camras and copiers.

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 * Interesting Facts:** People take Selenium for a diet. Selenium is used in shampoo for bad dandruff.