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in p-Block Elements by (48.1k points)

The atomic radius of Ga is less than atomic radius of Al. Why?

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The atomic radius of Ga is less than atomic radius of Al, because in between Ga and Al, there are ten elements of first transition series which have electrons in inner d-orbital. The inner d-orbital do not shield the nucleus effectively due to their shape and poor penetration power. As a result, effective nuclear charge in Ga becomes more than in Al and atomic radius of Ga is less than Al.

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