1.

Correct order of electron affinity of the halogen atoms is

Answer»

`F lt Cl lt Br lt I `
`F lt Cl ~ Br gt I`
`F gt Cl gt Br gt I`
`F gt Cl gt Br gt I`

Solution :Fluorine has unexpectedly less negative electron gain enthalpy than CHLORINE. Therefore, chlorine has the highest electron gain enthalpy in this group.
It is DUE to very SMALL size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small 2P sub-shell of fluorine and thus, the incoming electron does not FEEL much attraction. Thus, electron affinity among halogen varies as, `F < Cl > Br > I`.
Chlorine has the highest electron affinity in the periodic table.


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