A) Argon
B) Chlorine
C) Fluorine
D) Oxygen
Correct Answer: B
Solution :
The electron affinity increases on moving left to right in period and decreases on moving downward in a group. Thus, F should have highest electron affinity but due to its small size and high electron density the electron affinity of fluorine is lower than chlorine and therefore, chlorine has highest eletron affinity.
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