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Selenium at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Selenium
Symbol: Se
Atomic Number: 34
Atomic Mass: 78.96 amu
Melting Point: 217.0 °C (490.15 K, 422.6 °F)
Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F)
Number of Protons/Electrons: 34
Number of Neutrons: 45
Classification: Non-metal
Crystal Structure: Hexagonal
Density @ 293 K: 4.79 g/cm3
Color: gray

Atomic Structure

[Bohr Model of Selenium]  
Number of Energy Levels: 4

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 6


Isotope Half Life
Se-737.15 hours
Se-75119.78 days
Se-7965000.0 years


Date of Discovery: 1817
Discoverer: Jons Berzelius
Name Origin: From the Greek word Sel�n� (Moon)
Uses: photoelectric cells, TV cameras
Obtained From: refining of lead, copper, nickel

Related Links

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MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Selenium. <http://www.chemicalelements.com/elements/se.html>.

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