The increasing order of electron affinity for $Cl, Br$ and $I$ is .....

If the electron affinity of an element $M$ is $x \ kJ/mol$,then the ionisation potential of this element is:

Would you expect the second electron gain enthalpy of $O$ to be positive,more negative,or less negative than the first? Justify your answer.

Which of the following represents the correct order of increasing electron gain enthalpy (with negative sign) for the elements?
$a.$ Nitrogen
$b.$ Phosphorus
$c.$ Chlorine
$d.$ Fluorine

What is the correct order of electron affinity for $B, C, N$,and $O$?

The electron affinity values (in $kJ \ mol^{-1}$) for halogens $X, Y,$ and $Z$ are $-349, -333,$ and $-325$ respectively. Therefore,$X, Y,$ and $Z$ are respectively which of the following?