The first ionization enthalpy of magnesium is lower than the first ionization enthalpy of:

Lithium

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Sodium

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Calcium

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Beryllium

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Solution

The correct option is D Beryllium
The first ionization enthalpy of magnesium is lower than the first ionization enthalpy of Beryllium $(B e)$ because $B e, M g, C a$ belongs to one group, so down the group ionization energy will decrease so the first ionization enthalpy of magnesium is lower than the first ionization enthalpy of Beryllium $(B e) .$
Lithium sodium anyhow belongs to first group how ever they are having low ionization potentials than these $B e, M g, C a$
Hence option D is correct.

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