Which of the following has the greatest electron affinity?\

Question

Professor PC Thomas Classes · Answer

(d) : In general, the electron affinity decreases from top to bottom in a group. But in group 17, fluorine has lower electron affinity as compared to chlorine due to very small size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small $2 s$ orbitals of fluorine and thus, the incoming electron does not experience much attraction.\