Selenium Ionization Energy

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

Se -> Se¹⁺ = 940.9 kJ/mol = 225.10 Kcal/mol
Se¹⁺ -> Se²⁺ = 2044 kJ/mol = 489.00 Kcal/mol
Se²⁺ -> Se³⁺ = 2974 kJ/mol = 711.48 Kcal/mol
Se³⁺ -> Se⁴⁺ = 4144 kJ/mol = 991.39 Kcal/mol
Se⁴⁺ -> Se⁵⁺ = 6590 kJ/mol = 1576.56 Kcal/mol
Se⁵⁺ -> Se⁶⁺ = 7883 kJ/mol = 1885.89 Kcal/mol
Se⁶⁺ -> Se⁷⁺ = 14990 kJ/mol = 3586.12 Kcal/mol
Se⁷⁺ -> Se⁸⁺ = 19500 kJ/mol = 4665.07 Kcal/mol
Se⁸⁺ -> Se⁹⁺ = 23300 kJ/mol = 5574.16 Kcal/mol
Se⁹⁺ -> Se¹⁰⁺ = 27200 kJ/mol = 6507.18 Kcal/mol