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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

'There is no inductive method which could lead to the fundamental concepts of physics. Failure to understand this fact constituted the basic philosophical error of so many investigators of the nineteenth century.'

Albert Einstein
(1879-1955)





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