Strontium Ionization Energy

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

Sr -> Sr¹⁺ = 549.5 kJ/mol = 131.46 Kcal/mol
Sr¹⁺ -> Sr²⁺ = 1064.2 kJ/mol = 254.59 Kcal/mol
Sr²⁺ -> Sr³⁺ = 4210 kJ/mol = 1007.18 Kcal/mol
Sr³⁺ -> Sr⁴⁺ = 5500 kJ/mol = 1315.79 Kcal/mol
Sr⁴⁺ -> Sr⁵⁺ = 6910 kJ/mol = 1653.11 Kcal/mol
Sr⁵⁺ -> Sr⁶⁺ = 8760 kJ/mol = 2095.69 Kcal/mol
Sr⁶⁺ -> Sr⁷⁺ = 10200 kJ/mol = 2440.19 Kcal/mol
Sr⁷⁺ -> Sr⁸⁺ = 11800 kJ/mol = 2822.97 Kcal/mol
Sr⁸⁺ -> Sr⁹⁺ = 15600 kJ/mol = 3732.06 Kcal/mol
Sr⁹⁺ -> Sr¹⁰⁺ = 17100 kJ/mol = 4090.91 Kcal/mol