Which one of the following has the highest electron affinity?
Which one of the following has the highest electron affinity?
A. `F_(2)`
B. `Cl_(2)`
C. `Br_(2)`
D. `I_(2)`
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Correct Answer - B
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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