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{{Element | name=Selenium | symbol=Se | anumber=34| amass=79.0 amu | noe=34| class=Non-metal | cstructure=Hexagonal | color=Gray | date=1817 | discname=[[Jons Berzelius]] | origname=From the Greek word ''Selênê'' (Moon) | uses=Photoelectric cells, TV cameras | obtained=Refining of lead, copper, nickel}}
{{Element | name=Selenium | symbol=Se | anumber=34| amass=79.0 amu | noe=34| class=Non-metal | cstructure=Hexagonal | color=Gray | date=1817 | discname=[[Jöns Berzelius]] | origname=From the Greek word ''Selênê'' (Moon) | uses=Photoelectric cells, TV cameras | obtained=Refining of lead, copper, nickel}}
{{Template:Periodic table}}
{{Periodic table}}
'''Selenium''' ''(si-LEE-nee-em)'' is a conductive non-metal. It is primarily useful in electronic devices, especially in light-sensitive devices.
==History==
Selenium was discovered by a Swedish chemist named Jöns Jacob Berzelius, in 1817.<ref>http://education.jlab.org/itselemental/ele034.html</ref>
==Additional Properties==
Melting Point: 428.9 °F (220.5 °C or 493.65 K)
Boiling Point: 1265 °F (685 °C or 958 K)
Density: 4.809 grams per cubic centimeter
State of Matter at Room Temperature: Solid<ref>http://education.jlab.org/itselemental/ele034.html</ref>
Color: gray<ref>http://www.chemicalelements.com/elements/se.html</ref>
==Uses==
Selenium's electrical resistance is greatly affected by the amount of light shining on it. Bright light causes it to conduct better, while darkness reduces conductivity. This special property has made selenium useful in devices that respond to the intensity of light, such as electric eyes, photo cells, light meters for cameras and copiers. It is also is able to generate energy in direct sunlight. For this reason, it is a vital ingredient of solar cells.<ref>http://education.jlab.org/itselemental/ele034.html</ref>
Selenium is also useful in converting [[alternating current]] to [[direct current]], which is why it is used in [[rectifier]]s.
==References==
<references />
==External links==
*https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional
*http://www.chemicalelements.com/elements/se.html