The first ionization enthalpy of $Al$ is lower than that of $Mg$ because .......................

Which of the following species has the lowest ionization potential?

Explain the deviation in the ionization enthalpy of some elements from the general trend using the provided graph.

The correct order of $2^{nd}$ ionisation potential of carbon,nitrogen,oxygen and fluorine is

The incorrect order of $1^{st}$ $IP$ of the elements is

The given electronic configurations are for elements $X$,$Y$,and $Z$. Note that these configurations represent ions of the elements:
$X = [Ne] \, 3s^2 \, 3p^5$
$Y = [Ne] \, 3s^2 \, 3p^6$
$Z = [Ne] \, 3s^2 \, 3p^4$
Determine the correct statement regarding the energy changes associated with these configurations.