Phosphorus Ionization Energy

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

P -> P¹⁺ = 1011.7 kJ/mol = 242.03 Kcal/mol
P¹⁺ -> P²⁺ = 1903.2 kJ/mol = 455.31 Kcal/mol
P²⁺ -> P³⁺ = 2912 kJ/mol = 696.65 Kcal/mol
P³⁺ -> P⁴⁺ = 4956 kJ/mol = 1185.65 Kcal/mol
P⁴⁺ -> P⁵⁺ = 6273 kJ/mol = 1500.72 Kcal/mol
P⁵⁺ -> P⁶⁺ = 21268 kJ/mol = 5088.04 Kcal/mol
P⁶⁺ -> P⁷⁺ = 25397 kJ/mol = 6075.84 Kcal/mol
P⁷⁺ -> P⁸⁺ = 29854 kJ/mol = 7142.11 Kcal/mol
P⁸⁺ -> P⁹⁺ = 35867 kJ/mol = 8580.62 Kcal/mol
P⁹⁺ -> P¹⁰⁺ = 40958 kJ/mol = 9798.56 Kcal/mol