The correct order of second ionisation energy for the element C, N, O and F would be
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N AND O
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.
C AND F
The correct order of second ionisation potential of carbon, nitrogen, oxygen, fluorine is: O>F>N>C.
Explanation:
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