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The increasing order of atomic radii of ...

The increasing order of atomic radii of the following group 13 elements is

A

Al ltGaMInltTl

B

GaltAlltInltTl

C

AlltInltGaltTl

D

AlltGaltTlltIn

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The correct Answer is:
B
Increasing order of atomic radius of group 13 elements Ga lt Al lt In lt Tl . Due to poor sheiding of d-electrons in Ga, its radius decreases below Al.
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