The density of alkali metals is in the order:

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Question

(B) In general,moving down the group,the atomic mass increases more significantly than the atomic volume,leading to an increase in density for Group $

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$K < Na < Rb < Cs$

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(B) In general,moving down the group,the atomic mass increases more significantly than the atomic volume,leading to an increase in density for Group $I$ metals. However,there is an anomaly at $K$ due to the presence of an empty $3d$ subshell,which causes a larger increase in atomic volume compared to the increase in mass. The correct order of density for alkali metals is $Li < K < Na < Rb < Cs$.

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