PERIODIC ELEMENT
Np (Neptunium)

 



Atomic number : 93
Atomic mass : 237 g mol-1
Electronegativity according to Pauling : 1.3
Density : 20.25 g cm-3 at 20 °C
Melting point : 640 °C
Boiling point : 3902 °C
Vanderwaals radius : unknown
Ionic radius : unknown
Isotopes : 8
Electronic shell : unknown
Energy of first ionisation : unknown
Discovered by : McMillan in 1940
 
Atomic Structure Uses(No uses known)