A) F
B) \[Cl\]
C) Br
D) I
Correct Answer: B
Solution :
Key Idea: The electron affinity is the amount of energy released when an electron is added to isolated gaseous atom. The electron affinity decreases down the group because the size of atom increases. Among the halogens fluorine should have highest electron affinity but due to its small size, the added electron is repeled instead of being attracted towards nucleus. As a result its electron affinity decreases. \[\therefore \] Electron affinity of chlorine is highest among the given choices.
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