Calcium Ionization Energy

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

Ca -> Ca¹⁺ = 589.7 kJ/mol = 141.08 Kcal/mol
Ca¹⁺ -> Ca²⁺ = 1145 kJ/mol = 273.92 Kcal/mol
Ca²⁺ -> Ca³⁺ = 4910 kJ/mol = 1174.64 Kcal/mol
Ca³⁺ -> Ca⁴⁺ = 6474 kJ/mol = 1548.80 Kcal/mol
Ca⁴⁺ -> Ca⁵⁺ = 8144 kJ/mol = 1948.33 Kcal/mol
Ca⁵⁺ -> Ca⁶⁺ = 10496 kJ/mol = 2511.00 Kcal/mol
Ca⁶⁺ -> Ca⁷⁺ = 12320 kJ/mol = 2947.37 Kcal/mol
Ca⁷⁺ -> Ca⁸⁺ = 14207 kJ/mol = 3398.80 Kcal/mol
Ca⁸⁺ -> Ca⁹⁺ = 18191 kJ/mol = 4351.91 Kcal/mol
Ca⁹⁺ -> Ca¹⁰⁺ = 20385 kJ/mol = 4876.79 Kcal/mol