Molar ionization energies of the elements

These tables list values of molar ionization energies, measured in kJ⋅mol−1.

The first molar ionization energy applies to the neutral atoms.

The second, third, etc., molar ionization energy applies to the further removal of an electron from a singly, doubly, etc., charged ion.

For ionization energies measured in the unit eV, see Ionization energies of the elements (data page).

All data from rutherfordium onwards is predicted.