Inert gases have positive electron gain enthalpy. Its correct order is

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All the given elements belong to the group - 18. All noble gases have general electronic configuration ${ns}^{2} {np}^{6}$ except helium which has $1 s^{2}$ . Since noble gases have stable electronic configuration, they have no tendency to accept the electron and therefore, have large positive values of electron gain enthalpy.

Values of electron gain enthalpy of all the elements are given in the below table

Element	$Δ egH [KJ / mol]$
$He$	$+ 48$
$Ne$	$+ 116$
$Kr$	$+ 96$
$Xe$	$+ 77$

So, the order is $He < Xe < Kr < Ne$ .

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