The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because

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there is increase in the nuclear charge of the alkaline earth metal

there is decrease in the nuclear charge of the alkaline earth metal

there is no change in the nuclear charge

none of these

answer is A.

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Detailed Solution

Along the period from left to right, atomic number increases and, therefore, nuclear charge also increases. So first ionization energies of alkaline earth metals are higher than those of the alkali metals of the same period because of higher nuclear charge.

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