1.

Which one of the following has the highest electron affinity?

Answer»

`F_(2)`
`Cl_(2)`
`Br_(2)`
`I_(2)`

Solution :On moving down the group, electron affinity must decrease, because of the INCREASE in the size of the atom. However, fluorine has lower electron affinity than chlorine. A low value of electron affinity for fluorine is due to the small size of F atom. In a compact 2 p-orbitals of F, the ADDED electron does Ano not feel MUCH attraction, because of inter- electronic REPULSION between the electrons already PRESENT in small compact 2p-subshell of F atom,


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