Question

why electron gain enthalpy decrease as we move down the group​

Answer 1

Answer:

As we move down a group, both the atomic size and the nuclear charge increases. ... With the increase in atomic size, the attraction of the nucleus for the incoming electron decreases. Hence, the electron gain enthalpy becomes less negative.

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Answer 2

Answer:

This is because,as we go down the group both the atomic size and nuclear charge increases,but the effect of atomic size is more prominent than that of nuclear charge.Hence,the force of attraction between the nucleus and the added electron decreases and thus the enthalpy becomes less negative.

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