Information valid for Se-79 unless otherwise noted
[ATOM]

Selenium

 [ATOM]

Basic Information


Symbol: Se
Atomic Number: 34
Mass: 78.96
Melting Point: 217
Boiling Point: 684.9
Number of Protons/Electrons: 34
Number of Neutrons: 45
Classification: Non-metal
Crystal Structure: Hexagonal
Density: 4.79
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

Isotopes

Isotope Half Life
Se-737.15 hours
Se-74Stable
Se-75119.78 days
Se-76Stable
Se-77Stable
Se-78Stable
Se-7965000 years
Se-80Stable
Se-82Stable

Facts


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

Related Links

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