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:
BeN+ -> Be(N+1)+ + e-
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Be -> Be1+ = 899.4 kJ/mol = 215.17 Kcal/mol
\nBe1+ -> Be2+ = 1757.1 kJ/mol = 420.36 Kcal/mol
\nBe2+ -> Be3+ = 14848 kJ/mol = 3552.15 Kcal/mol
\nBe3+ -> Be4+ = 21006 kJ/mol = 5025.36 Kcal/mol
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