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Question

Arrange the following in increasing order of their atomic radius : Na, K, Mg, Rb.

A
Mg < K < Na < Rb
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B
Mg < Na < K < Rb
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C
Mg < Na < Rb < K
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D
Na < K < Rb <. Mg
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Solution

The correct option is A Mg < Na < K < Rb
Atomic radii increases on moving down a group from top to bottom and decreases as we move along a period from left to right. Therefore, the increasing order of atomic radius is Rb > K > Na > Mg.

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