Among the following,which has the highest first ionization energy?

Consider the elements $Ne$,$Na$,and $Mg$. The element with the highest first ionization enthalpy and the element with the lowest second ionization enthalpy,respectively,are:

$X_{(g)} \to X^{+}_{(g)} + e^-$,$\Delta H = +720 \ kJ \ mol^{-1}$
Calculate the amount of energy required to convert $110 \ mg$ of $X$ atom in gaseous state into $X^{+}$ ion .................... $kJ$ (Atomic weight for $X = 7 \ g \ mol^{-1}$)

Based on the values of $IE_1$ and $IE_2$,which of the following represents an alkali metal?

Which of the following presents the correct order of second ionization enthalpies of $C$,$N$,$O$ and $F$?

The incorrect statement among the following is: