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  4. Largest difference in radii is found in case of the pair

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Q. Largest difference in radii is found in case of the pair

AIIMSAIIMS 2007Classification of Elements and Periodicity in Properties

Solution:

Atomic as well as ionic radii increases from Li to $Fr$ due to the presence of one extra shell of electron.

Li Na K Rb Cs
Metallic radii (pm) 152 186 227 248 265