Question

Why is the electron gain enthalpy of O or F is less negative than that of the succeeding element in the group ?

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Answer 1

Answer:

Generally, electron gain enthalpy becomes less negative (decreases) as we go down the group because the size of the atom increases and the added electron will be farther from the nucleus.

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Answer 2

Explanation:

So, the electron gain enthalpy of O or F is less than that of succeeding element in their respective groups due to their smaller atomic size and more electron - electron repulsions