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InterviewSolution
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Would you expect the second electron gain enthalpy of `O` as positive, more negative or less negative than the first? Justify your answer. |
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Answer» When an electron is added to O atom to form O– ion, energy is released. Thus, the first electron gain enthalpy of O is negative. `O_((g))+e^(+) rarr O_(g)^(-)` On the other hand, when an electron is added to `O^(-)` ion to form `O^(2-)` ion, energy has to be given out in order to overcome the strong electronic repulsions. Thus, the second electron gain enthalpy of O is positive `O_((g))^(-) +e^(-)rarrn O_((g))^(2-)` |
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