JEE Main Chemistry question

Fluorine has lower electron affinity than chlorine because of

(A)Bigger radius of fluorine, less density
(B)Smaller radius of fluorine, high (electron) densityCorrect
(C)Smaller radius of chlorine, high density
(D)Smaller radius of chlorine, less density

Answer: (B)

Solution

Fluorine's atomic radius is smaller than chlorine's, so its 2p orbital is compact and already crowded with electron density; adding one more electron causes significant inter-electronic repulsion, which reduces the energy

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Question ID VK-133287