Lutetium Ionization Energy

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

Lu -> Lu¹⁺ = 523.5 kJ/mol = 125.24 Kcal/mol
Lu¹⁺ -> Lu²⁺ = 1340 kJ/mol = 320.57 Kcal/mol
Lu²⁺ -> Lu³⁺ = 2022 kJ/mol = 483.73 Kcal/mol
Lu³⁺ -> Lu⁴⁺ = 4360 kJ/mol = 1043.06 Kcal/mol