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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
xUmp Science eStore

Science Quote

Albert Einstein Photo

'Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.'

Albert Einstein
(1879-1955)


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