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Which of the following will have the most negative electron gain enthalpy and which the least negative? P, S, Cl, F

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Halogens have the highest negative value of electron gain enthalpy. Here and both are halogens but electron gain enthalpy of is more negative than because of the very small size of which causes interelectronic repulsion among its electrons.

Final answer:
has the most negative one. has the least negative one due to the larger size.

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