Give me increasing order of alkali earth metals based on 1st ionisation enthalpy...​

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Explanation:

Solution : Ionization enthalpy decreases as the atomic size , increases , i.e., Li>Na>K>Rb.

Alkali metals have the lowest ionization energy in each period. Within the group, as we go down, the ionization energies of alkali metals decrease due to their atomic size being the largest in their respective periods. As the nuclear charge increases it requires more energy to remove electron(Ionization energy) hence ionization energy will be increased. The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because of the increase in the nuclear charge of the alkaline earth metal.

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