Which of the following is a favourable factor for cation formation?

The correct order of ionisation energy of $C$,$N$,$O$,and $F$ is

The correct order of $IE_2$ (second ionization enthalpy) is:

The second ionisation energies of $Li, Be, B$ and $C$ are in the order

The first ionization enthalpies of $Li$,$Be$,and $C$ are $520$,$899$,and $1086 \ kJ \ mol^{-1}$ respectively. Which of the values $800$ or $900 \ kJ \ mol^{-1}$ is more likely for the first ionization enthalpy of $B$? Why?

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