Nickel Ionization Energy

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

Ni -> Ni¹⁺ = 736.7 kJ/mol = 176.24 Kcal/mol
Ni¹⁺ -> Ni²⁺ = 1753 kJ/mol = 419.38 Kcal/mol
Ni²⁺ -> Ni³⁺ = 3393 kJ/mol = 811.72 Kcal/mol
Ni³⁺ -> Ni⁴⁺ = 5300 kJ/mol = 1267.94 Kcal/mol
Ni⁴⁺ -> Ni⁵⁺ = 7280 kJ/mol = 1741.63 Kcal/mol
Ni⁵⁺ -> Ni⁶⁺ = 10400 kJ/mol = 2488.04 Kcal/mol
Ni⁶⁺ -> Ni⁷⁺ = 12800 kJ/mol = 3062.20 Kcal/mol
Ni⁷⁺ -> Ni⁸⁺ = 15600 kJ/mol = 3732.06 Kcal/mol
Ni⁸⁺ -> Ni⁹⁺ = 18600 kJ/mol = 4449.76 Kcal/mol
Ni⁹⁺ -> Ni¹⁰⁺ = 21660 kJ/mol = 5181.82 Kcal/mol