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The atomic radii of the alkali metals follow the order(a) Li > Na > K > Cs(b) K > Cs > Li > Na(c) Na > K > Cs > Li(d) Cs > K > Na > Li |
Answer» Answer is : (d) Cs > K > Na > Li On moving down the group, as the atomic number of alkali metal increases, their atomic radii also increases because here shielding effect predominates over nuclear charge. Thus, the correct order of atomic radii of alkali metal is Cs > K > Na > Li |
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