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Q.
Alkaline earth metals are denser than alkali metals, because metallic bonding in alkaline earth metals, is
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Solution:
Alkaline earth metals $ (n{{s}^{2}}) $ are denser than alkali metals $ (n{{s}^{1}}) $ because metallic bonding in alkaline earth metals is stronger than alkali metals due to presence of two electrons in valence shell as compared to one electron in alkali metals.