First slide

Trends in Atomic Properties & Physical Properties

Question

Correct trend regarding density of alkalimetals is

Easy

A

Li < Na < K < Rb < Cs
B

Li < Na < Rb < K < Cs
C

Li < K < Na < Rb < Cs
D

Li < K < Na < Cs < Rb

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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