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. read less
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