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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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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. On the other hand, when an electron is added to O– ion to form O2– ion, energy has to be given out in order to overcome the strong electronic repulsions....
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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.

On the other hand, when an electron is added to O ion to form O2– 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.

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