Generally the ionization enthalpy in a period increases but there are some exceptions, the one which is not an exception is?

Be and B

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N and O

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Mg and Al

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Na and Mg

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Solution

The correct option is D
Na and Mg

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 and B, and N and O, Be is more stable because of its electronic configuration.

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Similar questions

Q. Generally, the first ionization enthalpy increases along a period with few exceptions. Choose the correct option which is not an exception.

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Generally the ionization enthalpy in a period increases but there are some exceptions, the one which is not an exception is?

The correct option is D Na and Mg 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 and B, and N and O, Be is more stable because of its electronic configuration.

The correct option is D
Na and Mg

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 and B, and N and O, Be is more stable because of its electronic configuration.