Explain the value of electron gain enthalpy of noble gases. Give reasons for your answer.

(N/A) The electron gain enthalpy of noble gases is positive.

Group $18$ element	$He$,$Ne$,$Ar$,$Kr$,$Xe$,$Rn$
$\Delta_{eg} H$ $(kJ \ mol^{-1})$	$+48$,$+116$,$+96$,$+96$,$+77$,$+68$

The electron gain enthalpy of $Ne$ is the most positive.
Noble gases have a stable electronic configuration with a complete octet $(ns^2 np^6)$. Due to this stable configuration,they have no tendency to accept an additional electron. Therefore,a large amount of energy is required to force an electron into the next higher energy shell,resulting in a positive value for electron gain enthalpy.