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  • Which among the following is correct order of densities for alkali metals?Option: 1 Li < K < Na < Rb < Cs<div class='qna-op

Which among the following is correct order of densities for alkali metals?

Option: 1

Li < K < Na < Rb < Cs


Option: 2

Li < Na < K < Rb < Cs


Option: 3

Cs < Rb < K < Na < Li


Option: 4

K < Na < Li < Rb < Cs


Answers (1)

best_answer

Density is the ratio of mass and volume. 

As we move down the group, the number of protons and neutrons increase adding to the atomic mass whereas atomic size (volume) does not increase commensurate to the atomic mass. It results into increase in density down the group. 

However, potassium (K) is an exception to this. As we move from Na to K, the mass increases

But the volume increases unusually more. So, the volume of K is lower than Na.

 

Posted by

Sanket Gandhi

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