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Helium

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name Helium
latin Helium
french Hélium
german Helium
symbol He
proton number 2
atomic weight 4.002602
Pauling electronegativity -
electronic configuration 1s2
melting point 0.95 K, -272.2°C, -457.96°F
boiling point 4.22 K, -268.93°C, -452.07°F
group 18
period 1
state (by 20°C) gas
oxidation states -
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Discoverer

Year of discovery Discoverers
1868 Pierre Janssen (1824-1907)
1895 Sir William Ramsay (1852-1916) and independently Nils Abraham Langlet (1868-1936) and Per Teodor Cleve (1840-1905)

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