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

Explanation

Ionisation potential of `He^(+) = 13.6 xx 2^(2) = 54.4 eV`
Ionisation potential of `Li^(2+) = 13.6 xx 3^(2) = 122.4 eV`