In alkaline earth metals, the electrons are more firmly held to the nuclues and hence

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Ionization energy of alkaline earth metals is greater than that of alkali metals

Alkaline earths are less abundant in nature

Reactivity of alkaline earth metals is greater than that of alkali metals

Atoms of alkaline earth metals are bigger in size than alkali metals

answer is A.

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Detailed Solution

Effective nuclear forces of attractions on the valency electron increasesTherefore Ionisation energy increases

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