Tantalum Ionization Energy

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

Ta -> Ta¹⁺ = 761 kJ/mol = 182.06 Kcal/mol
Ta¹⁺ -> Ta²⁺ = 1500 kJ/mol = 358.85 Kcal/mol
Ta²⁺ -> Ta³⁺ = 2100 kJ/mol = 502.39 Kcal/mol
Ta³⁺ -> Ta⁴⁺ = 3200 kJ/mol = 765.55 Kcal/mol
Ta⁴⁺ -> Ta⁵⁺ = 4300 kJ/mol = 1028.71 Kcal/mol