Variation of total ionization energies of Al(n+) as a function of n from n=1 to n=8. Explain the discontinuity in your curve.

The discontinuity in the curve would be present at Al+ , Al3+ , Al6+ (All these are stabilised states due to completely or half filled atomic subshells). Al3+ is the greatly stabilised due to noble gas configuration. A+ sue to half filled s subshell and Al6+ due to half filled p subshell.

Other than this thse discontinuities, the ionization enthalpies would increase with oxn state as effective nuclear chrge would increase.