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  4. The increasing order of the density of alkali metals is

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Q. The increasing order of the density of alkali metals is

KEAMKEAM 2011Classification of Elements and Periodicity in Properties

Solution:

On moving downward in a group, density increases but the density of K is somewhat lesser than Na.
Thus, the order of density is Li < K < Na < Rb < Cs
Densities are
Li - 0.53 g/cc
Na - 0.97 g/cc
K-0.86 g/cc
Rb - 1.53 g/cc
Cs - 1.90 g/cc