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Generally the ionisation potential in a period
increases, but there are some exceptions. The
one which is not an exception is

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Be & B

N & O

Mg & Al

Na & Mg

answer is D.

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Detailed Solution

We know that the ionization energy increases normally from sodium to magnesium as Mg has a higher effective nuclear charge as compared to Na.

In the case of Be & B, N&O, Be and N are more stable because of its electronic configuration.

Hence, option(D) is the answer.

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