Thorium Ionization Energy

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

Th -> Th¹⁺ = 587 kJ/mol = 140.43 Kcal/mol
Th¹⁺ -> Th²⁺ = 1110 kJ/mol = 265.55 Kcal/mol
Th²⁺ -> Th³⁺ = 1978 kJ/mol = 473.21 Kcal/mol
Th³⁺ -> Th⁴⁺ = 2780 kJ/mol = 665.07 Kcal/mol