Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer

We are taking about electron gain enthalpy and NOT the ionization energy (as the two esteemed chemists have reported here). The first electron gain enthalpy will be negative as O both neutral and looking for electrons to complete its octet (2s² 2p⁴). Once it accepts an electron and becomes O^-; then the next electron will only be accepted by this ion if this electron is bombarded with energy, hence the second electron gain enthalpy will be positive.

Electronic configuration of O is 1s2, 2s2, 2p4First electron is to be removed from 2p4 orbital. Th e2nd electron is to be removed from extra stable half filled 2p3 orbital it would require extra energy. Hence 2nd ionization energy is more positive than first one