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Se - Selenium

Selenium

 Selenium 
Se
Atomic Number: 34
Atomic Weight: 78.96
Element Type: Non-Metal
Crystal Structure: Hexagonal
Melting Point: 221.0°C = 429.8°F = 494.15 K
Boiling Point: 685.0°C = 1265.0°F = 958.15 K
Critical Temp: 1493.0°C = 2719.4°F = 1766.15 K
Atomic Radius: 1.22 Å (Å = Angstrom = 10-10 m)
Covalent Radius: 1.16 Å
Electronegativity: 2.55

History

(Gr. Selene, moon) Discovered by Berzelius in 1817, who found it associated withtellurium, named for the earth.


Sources


Science Quote

'Strange is our situation here upon the earth. Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose.'

Albert Einstein
(1879-1955)


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