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NEET levelSingle correct optionDifficulty 1 of 3ph002

Among the halogens, which one has the most negative electron gain enthalpy?

A $F$
B $Br$
C $I$
D $Cl$

Answer: D

Fluorine is so small that added electrons feel strong repulsion in the compact

2 p

subshell, so its electron gain enthalpy is less negative than that of chlorine. Chlorine therefore has the most negative value in the group.

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