The element which cannot form peroxide is

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(C) Among the alkali metals,$Li$ reacts with oxygen to form only the monoxide $(Li_2O)$ because the $Li^+$ ion is very small and has a high charge den

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$Li$

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(C) Among the alkali metals,$Li$ reacts with oxygen to form only the monoxide $(Li_2O)$ because the $Li^+$ ion is very small and has a high charge density,which stabilizes the small $O^{2-}$ ion. It cannot form a peroxide $(Li_2O_2)$ or superoxide $(LiO_2)$ because the larger peroxide and superoxide ions are not stable in the presence of the small $Li^+$ ion. $Na$ forms peroxide $(Na_2O_2)$,while $Sr$ and $Ba$ (alkaline earth metals) form peroxides ($SrO_2$ and $BaO_2$ respectively).

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