Actinium Ionization Energy

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

Ac -> Ac¹⁺ = 499 kJ/mol = 119.38 Kcal/mol
Ac¹⁺ -> Ac²⁺ = 1170 kJ/mol = 279.90 Kcal/mol
Ac²⁺ -> Ac³⁺ = 1900 kJ/mol = 454.55 Kcal/mol
Ac³⁺ -> Ac⁴⁺ = 4700 kJ/mol = 1124.40 Kcal/mol
Ac⁴⁺ -> Ac⁵⁺ = 6000 kJ/mol = 1435.41 Kcal/mol
Ac⁵⁺ -> Ac⁶⁺ = 7300 kJ/mol = 1746.41 Kcal/mol
Ac⁶⁺ -> Ac⁷⁺ = 9200 kJ/mol = 2200.96 Kcal/mol
Ac⁷⁺ -> Ac⁸⁺ = 10500 kJ/mol = 2511.96 Kcal/mol
Ac⁸⁺ -> Ac⁹⁺ = 11900 kJ/mol = 2846.89 Kcal/mol
Ac⁹⁺ -> Ac¹⁰⁺ = 15800 kJ/mol = 3779.90 Kcal/mol