(i) The first ionization enthalpies of alkali and alkaline earth metals are
generally low. However, ionization enthalpies of IIA group elements are
higher than IA group elements.
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Hence 1st ionization enthalpies of IA and IIA group elements are generally low. Since each Alkaline earth metal has one extra I proton than corresponding alkali metal. This higher nuclear charge attracts electrons more strongly; hence increase the ionization enthalpies of A group.
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areenanoman:
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