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Michael Sowers

Selenium
General Information and Atomic Structure
Name of the element- Selenium
Symbol- Se
Atomic Number – 34
Atomic mass- 78.96 atomic mass units
Number of protons and number of electrons- 34
Most common isotope-Se-80
Amount of neutrons in most common isotope- 46
Background
Scientist of who discovered the element- Jons Berzelius
Year discovered- 1817
Origin of its name- From the Greek word Selene (Moon)
Chemical Family- Nonmetals
Common uses- photoelectric cells, TV cameras
Physical Properties
State of matter at room temperature- Solid
Melting Point- 217.0 °C
Boiling Point- 684.9 °C
Density- 4.79 g/cm3
Abundance in the Earth’s crust- 5×10-6%
Chemical Properties-
Other elements that will react with this element- Hydrogen, Sodium
At least two compounds that contain this element- Hydrogen Selenide (H2Se), Sodium Selenite (Na2SeO3)

The element Selenium, coming from the greek root word of Selene meaning moon, has many different uses in our world today. Dependent upon light hitting it, Selenium is able to produce electricity and is also able to convert light to electricity. Specifically, it is used in photoelectric cells, light meters, TV cameras, photocopiers, solar cells and semi-conductors. In addition, Selenium can add the color red to glass or remove color from glass.

"Selenium." Minerals Education Coalition. N.p., n.d. Web. 04 Jan. 2015.
"Periodic Table: Selenium." N.p., n.d. Web. 3 Jan. 2015.
"Chemical Elements.com - Selenium (Se)." Chemical Elements.com - Selenium (Se). N.p., n.d. Web. 04 Jan. 2015.
"#34 - Selenium - Se." #34 - Selenium - Se. N.p., n.d. Web. 02 Jan. 2015.
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