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The following trend correctly represents the variation of density in alkali metals

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Cs > Rb > K > Na > Li

Cs > Rb > Na > K > Li

Cs > Rb > K > Li > Na

Cs > Na > K > Rb > Li

answer is B.

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Detailed Solution

Density…..Li < K < Na < Rb < Cs;

Due larger inter atomic distances and availability of vacant orbitals in Potassium, it is less denser than Sodium.

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