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

The electron affinity for the inert gases is

Arrange $N$,$S$,$O$ and $F$ in order of decreasing electron gain enthalpy.

The amount of energy released for the process $X_{(g)} + e^- \to X^-_{(g)}$ is minimum and maximum respectively for :-
$(a) \ F$
$(b) \ Cl$
$(c) \ N$
$(d) \ B$
Correct answer is :-

The increasing order of electron affinity for the given electronic configurations of elements is:
$I. 1s^2 2s^2 2p^6 3s^2 3p^5$
$II. 1s^2 2s^2 2p^3$
$III. 1s^2 2s^2 2p^5$
$IV. 1s^2 2s^2 2p^6 3s^1$

The order of negative electron gain enthalpy of $Li$,$Na$,$S$,$Cl$ is