Increasing order of density is:
(1) Li < K < Na < Rb < Cs
(2) Li < Na < K < Rb < Cs
|3) Cs < Rb < K < Na < Li
(4) K < Li < Na < Rb < Cs

Answer: Option 1
Explanation:
The density of alkali metals increases down the group from Li to Cs. Potassium is lighter than sodium.

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