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Generally, the first ionisation energy i...

Generally, the first ionisation energy increases along a period. But there are some exceptions one which is not an exception is

A

N and O

B

Na and Mg

C

Mg and Al

D

Be and B

Text Solution

Verified by Experts

The correct Answer is:
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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