Calculate the ionisation potential of a single ionised He-atom.

The ionisation potential of H_2 atom is

Calculate the ionisation energy of H atom.

Ionisation potential of hydrogen is ?

The ionisation potential of H-atom is 13.6 eV. Calculate the ionisation potential of He^(+) and Li^(2+) ions.

The ionisation potential of hydrogen atom is

The ionisation potential of hydrogen atom is