JEE Main Chemistry question

Correct order of first ionisation potential among the following elements Be, B, C, N, O is [J & K CET 2003]

Answer: (A)

Solution

Approximate values (eV): B = 8.3, Be = 9.3, C = 11.3, O = 13.6, N = 14.5. Be's filled and N's half-filled both show anomalous extra

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Question ID VK-133212