Question

Explain the periodicity of electron gain enthalpy in a group.

Answer 1

Answer:

heya..

here is ur answer..

Variation in electron gain enthalpy in the period: In the modern periodictable, on moving from left to right across a period, the atomic size of elements decreases and the effective nuclear charge increases. ... Variation of electron gain enthalpy in a group: Generally, when we move down in agroup becomes less negative.

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Answer 2

Down the group electron gain enthalpy (∆Heg) decreases because size increases. The force between the nuclear charge and the incoming electron decreases hence ∆Heg decreases

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