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

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Q 3143001843.     Give reason for the following:
(i) Halogens act as good oxidising agent.
(ii) Electron gain enthalpy of noble gas is almost zero.
(iii) `Na` and `Mg^+` have same number of electrons but removal of electron from
`Mg^+` requires more energy.

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