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