Praseodymium Ionization Energy

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

Pr -> Pr¹⁺ = 523.1 kJ/mol = 125.14 Kcal/mol
Pr¹⁺ -> Pr²⁺ = 1018 kJ/mol = 243.54 Kcal/mol
Pr²⁺ -> Pr³⁺ = 2086 kJ/mol = 499.04 Kcal/mol
Pr³⁺ -> Pr⁴⁺ = 3761 kJ/mol = 899.76 Kcal/mol
Pr⁴⁺ -> Pr⁵⁺ = 5543 kJ/mol = 1326.08 Kcal/mol