Question
Chemistry Question on GROUP 1 ELEMENTS
The increasing order of the density of alkali metals is
A
Li < K < Na < Rb < Cs
B
Li < Na < K < Rb < Cs
C
Cs < Rb < Na < K < Li
D
Cs < Rb < K < Na < Li
Answer
Li < K < Na < Rb < Cs
Explanation
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