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  4. Among P, S, Cl, F, the elements with most negative and least negative electron gain enthalpy respectively, are

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Q. Among $P, S, Cl, F$, the elements with most negative and least negative electron gain enthalpy respectively, are

J & K CETJ & K CET 2015Classification of Elements and Periodicity in Properties

Solution:

Generally, electron gain enthalpy increases as we move from left to right in a period and decreases as we go down in a group. But electron affinities of second period elements $(F, N)$ are less negative as compared to corresponding third period element. This is because of the small atomic size of second period elements. Hence, the correct order electron affinities is $ P < S < F < Cl $ Least negative $(EA)$ Most negative $(EA)$