Neptunium

Source: http://www.tabulka.cz/english/elements/show.asp?id=93

name Neptunium
latin Neptunium
french Neptunium
german Neptunium
symbol Np
proton number 93
atomic weight 237.0482
Pauling electronegativity 1.36
electronic configuration [Rn] 5f46d17s2
1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f46d17s2
melting point 910 K, 637°C, 1178°F
boiling point 4273 K, 4000°C, 7232°F
group -
period 7
state (by 20°C) solid
oxidation states +3, +4, +5, +6

Discoverer

Year of discovery Discoverers
1940 Edwin M. McMillan (1907-1991)
P. H. Abelson


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