First slide
Trends in Atomic Properties & Physical Properties
Question

Correct trend regarding density of alkalimetals is

Easy
Solution

Density down the group increases
Expected trend: Li < Na < K < Rb < Cs; 

Due to larger interatomic distances and availability of vacant d-orbitals in potassium, density of potassium is less than that of sodium;

Actual trend; Li < K < Na < Rb < Cs
 

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