The second electron gain enthalpy of an eleme | vedclass

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(B) When an electron is added to a neutral atom,energy is released,making the first electron gain enthalpy negative. However,when a second electron is

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is always positive

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(B) When an electron is added to a neutral atom,energy is released,making the first electron gain enthalpy negative. However,when a second electron is added to a uninegative ion $(X^-)$,there is a strong electrostatic repulsion between the incoming electron and the negatively charged ion. To overcome this repulsion,energy must be supplied to the system. Therefore,the second electron gain enthalpy is always positive.

The second electron gain enthalpy of an element:

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