Question

Explain the periodicity of electron gain enthalpy in a group

Answer 1

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when we move down in a group becomes less negative. 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 enthalpy becomes less negative.

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Answer 2

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