Generally, the first ionisation energy increases along a period. But t – InterviewSolution

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1.	Generally, the first ionisation energy increases along a period. But there are some exceptions one which is not an exception isA. N and OB. Na and MgC. Mg and AlD. Be and B
Answer» Correct Answer - B Be, N and Mg have higher values than expected, this is due to stable configurations of these elements. Be and Mg have fully-filled orbitals, in nitrogen 2p-orbitals are half-filled.

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