Periodic Table of the Elements
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Selenium

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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
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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
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Discoverer

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

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