9. Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has A.High bond dissociation energy B.Smaller atomic radius C.Stable half filled 2p sub level D.High nuclear charge
Answer: Option C Solution: Nitrogen has a half filled orbital. On the other hand, since Oxygen is already unstable relative to Nitrogen, by losing one electron it attains a stable half filled orbital. So oxygen undergoes ionisation at a relatively lower energy. This is why nitrogen has a higher ionisation energy than oxygen.
