Compare alkali metals and homework agents with respect to their valency atomic size and
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do you mean alkali metals and halogens??
alkali metals have valency 1 and halogens have valency of 1 as well.
the no of valence electrons in lkali metals is 1 while that of halogens is 7.
alkali metals have larger atomic radii than the halogens as atomic radius decreases along the period the nuclear charge increases.
hope this helps!
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