i) Sodium is less reactive than potassium (ii) Alkali and alkaline earth metals are not obtained by chemical reduction methods (iii) MgSO₄ is readily soluble in water while BaSO₄ is not
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It has one electron in the outermost electron shell and thus wants to give up one electron to a highly electronegative element. Within the alkali metals, sodium is more reactive than lithium but less reactive than potassium. Its ionization energy is higher than potassium but lower than lithium.
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