Selenium

Source: http://www.tabulka.cz/english/elements/show.asp?id=34

name Selenium
latin Selenium
french Sélénium
german Selen
symbol Se
proton number 34
atomic weight 78.96
Pauling electronegativity 2.55
electronic configuration [Ar] 3d104s24p4
1s22s22p63s23p63d104s24p4
melting point 494 K, 221°C, 430°F
boiling point 958 K, 685°C, 1265°F
group 16
period 4
state (by 20°C) solid
oxidation states -2, +4, +6

Discoverer

Year of discovery Discoverer
1817 Jons J. Berzelius (1779-1848)


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