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

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Ionization enthalpy 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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Ionization enthalpies of alkaline earth metal are greater than those of alkali metals due to increased nuclear charge.

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