a) compare the hydration enthalpies and 2nd ionisation enthalpies of the alkali and alkaline earth metals
b) give the chemical formula pop
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a.)Alkali metals have higher value of 2nd ionization enthalpy than alkaline earth metals. since they achieve a stable noble gas configuration after loosing 1 electron from ns1 shell. Alkaline earth metal ions have higher value of hydration enthalpy because of their smaller ionic size than alkali metals.
b.)second question was not clear to me to I not have answer sorry...
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