Hafnium Ionization Energy

The Hafnium Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Hafnium.
Hf -> Hf+ + e-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Hafnium is:
HfN+ -> Hf(N+1)+ + e-

Hafnium Ionization Energy

Hf -> Hf1+ = 642 kJ/mol = 153.59 Kcal/mol
Hf1+ -> Hf2+ = 1440 kJ/mol = 344.50 Kcal/mol
Hf2+ -> Hf3+ = 2250 kJ/mol = 538.28 Kcal/mol
Hf3+ -> Hf4+ = 3216 kJ/mol = 769.38 Kcal/mol