The increasing order of the first ionization enthalpies of the elements $B$,$P$,$S$ and $F$ (lowest first) is:

The electronic configurations of elements $A, B$ and $C$ are $[He] 2s^1$,$[Ne] 3s^1$ and $[Ar] 4s^1$ respectively. Which one of the following orders is correct for the first ionization potentials (in $kJ \ mol^{-1}$) of $A, B$ and $C$?

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

Which of the following transitions involves the maximum amount of energy?

Which of the following sets has the highest sum of $IE$ values compared to all other sets mentioned?

The order of the magnitude of first ionisation potentials of $Be$,$B$,$N$ and $O$ is