Name :  Neptunium
Symbol :  Np
Atomic Number :  93
Atomic Weight :  237.0482
Specific Heat :  0.12 J/gK
Melting Point :  640°C
Vaporization :  -
Boiling Point :  3902°C
Electronegativity :  1.36
Density@293 K :  20.45 g/cm³
Discovered :  E.M. McMillan, P.H. Abelson, United States, 1940
Description :  Rare, silvery radioactive metal.
Uses :  It has no significant commercial applications.