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:
PN+ -> P(N+1)+ + e-
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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
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