Source: http://www.tabulka.cz/english/elements/show.asp?id=2

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 -


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)

Copyright © 1998-2023 Jan Straka
All rights reserved.