Samarium Ionization Energy

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

Sm -> Sm¹⁺ = 543.3 kJ/mol = 129.98 Kcal/mol
Sm¹⁺ -> Sm²⁺ = 1068 kJ/mol = 255.50 Kcal/mol
Sm²⁺ -> Sm³⁺ = 2260 kJ/mol = 540.67 Kcal/mol
Sm³⁺ -> Sm⁴⁺ = 3990 kJ/mol = 954.55 Kcal/mol