Alkali metals .........

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(A) . Alkali metals are highly electropositive and form ionic salts.
Due to the high charge density of the $Li^+$ ion,it is highly hydrated,which is

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form hydrated salts

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(A) . Alkali metals are highly electropositive and form ionic salts.
Due to the high charge density of the $Li^+$ ion,it is highly hydrated,which is why alkali metals (specifically $Li$) form hydrated salts (e.g.,$LiCl \cdot 2H_2O$).
Reactivity with oxygen increases from $Li$ to $Cs$ because the ionization energy decreases down the group.
Electronegativity decreases from $Li$ to $Cs$ as the atomic size increases.

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