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Q. Radius of $ Ga $ is less than $ Al $ because of

Rajasthan PMTRajasthan PMT 2007Classification of Elements and Periodicity in Properties

Solution:

The atomic radius of $ Al=143\,\,r/pm $ is $ 135\,\,r/pm $ . The radius of $ Ga $ is less than $ Al $ due to greater screening effect in $ Al $ (It has $8$ electrons in the penultimate shell).