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Generally, the first ionization enthalpy...

Generally, the first ionization enthalpy increases along a period. But there are some exceptions. One which is NOT an expection is:

A

Na and Mg

B

Be and B

C

N and O

D

Mg and Al

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The correct Answer is:
A
Na and Mg is not an exception because there is no half-filled or completely filled orbital in them.
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