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Q.

The increasing order of atomic radii of the following group 13 elements is__?

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a

Al

b

Ga

c

Al

d

Al

answer is B.

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Detailed Solution

The atomic radii of this family follow a irregular order due to d orbital contraction and f orbital contraction. The size of Ga is decreased due to poor shielding by the d orbital electrons and the value turns out to be less than Al.
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The increasing order of atomic radii of the following group 13 elements is__?