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The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is
A. Na `gt` K `gt` Mg `gt` Rb
B. K `gt` Na `gt` Mg `gt` Rb
C. Na `gt` Mg `gt` K `gt` Rb
D. Mg `gt` Na `gt` K `gt` Rb.

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Correct Answer - D
The increasing order of atomic radius (metallic) is
Mg(160 pm) `lt` Na (180 pm) `lt` K (227 pm) `lt` Rb (248 pm)

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