Beryllium Ionization Energy

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

Be -> Be¹⁺ = 899.4 kJ/mol = 215.17 Kcal/mol
Be¹⁺ -> Be²⁺ = 1757.1 kJ/mol = 420.36 Kcal/mol
Be²⁺ -> Be³⁺ = 14848 kJ/mol = 3552.15 Kcal/mol
Be³⁺ -> Be⁴⁺ = 21006 kJ/mol = 5025.36 Kcal/mol