Uranium Ionization Energy

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

U -> U¹⁺ = 584 kJ/mol = 139.71 Kcal/mol
U¹⁺ -> U²⁺ = 1420 kJ/mol = 339.71 Kcal/mol