Give reason for the following questions

Give reason for the following.
(i) Halogens act as good oxidising agent.
(ii) Electron gain enthalpy of noble gas is almost zero.

(i) Due to highly negative electron gain enthalpy they act as good oxidising agent as they can gain electrons easily.
(ii) Electronic configuration of noble gases is such that all sub-shells are completely filled. Hence, their electron gain enthalpy is almost zero.