Dysprosium Ionization Energy

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

Dy -> Dy¹⁺ = 571.9 kJ/mol = 136.82 Kcal/mol
Dy¹⁺ -> Dy²⁺ = 1126 kJ/mol = 269.38 Kcal/mol
Dy²⁺ -> Dy³⁺ = 2200 kJ/mol = 526.32 Kcal/mol
Dy³⁺ -> Dy⁴⁺ = 4001 kJ/mol = 957.18 Kcal/mol