Neptunium Ionization Energy
The Neptunium Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Neptunium.
Np -> Np+ + e-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Neptunium is:
NpN+ -> Np(N+1)+ + e-
Neptunium Ionization Energy
Np -> Np1+ = 597 kJ/mol = 142.82 Kcal/mol