Nitrogen has positive electron gain enthalpy
Question:

Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However, oxygen has lower ionisation enthalpy than nitrogen. Explain.

Solution:

The ionisation enthalpy of oxygen is lower than that of Nitrogen as because when we remove one electron from oxygen then it easily donates it to attain half-filled stability

but in case of nitrogen, it is difficult to remove one electron as it already has half-filled stability and it would become unstable after that.

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