The Erbium Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Erbium.
Er -> Er+ + e-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Erbium is:
ErN+ -> Er(N+1)+ + e-
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Er -> Er1+ = 588.7 kJ/mol = 140.84 Kcal/mol
Er1+ -> Er2+ = 1151 kJ/mol = 275.36 Kcal/mol
Er2+ -> Er3+ = 2194 kJ/mol = 524.88 Kcal/mol
Er3+ -> Er4+ = 4115 kJ/mol = 984.45 Kcal/mol
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