Osmium Ionization Energy

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

Os -> Os¹⁺ = 840 kJ/mol = 200.96 Kcal/mol
Os¹⁺ -> Os²⁺ = 1600 kJ/mol = 382.78 Kcal/mol
Os²⁺ -> Os³⁺ = 2400 kJ/mol = 574.16 Kcal/mol
Os³⁺ -> Os⁴⁺ = 3900 kJ/mol = 933.01 Kcal/mol
Os⁴⁺ -> Os⁵⁺ = 5200 kJ/mol = 1244.02 Kcal/mol
Os⁵⁺ -> Os⁶⁺ = 6600 kJ/mol = 1578.95 Kcal/mol
Os⁶⁺ -> Os⁷⁺ = 8100 kJ/mol = 1937.80 Kcal/mol
Os⁷⁺ -> Os⁸⁺ = 9500 kJ/mol = 2272.73 Kcal/mol