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Which of the following group 13 element...

Which of the following group `13` elements has the smallest atomic radius?

A

`Al`

B

`Ga`

C

`In`

D

`Tl`

Text Solution

Verified by Experts

The correct Answer is:
B
The overall order is
`Ga lt Al lt In lt Tl`
The smaller size of `Ga` relative to `Al` is due to the presence of poor shielding `10` d-electrons in its penultimate shell.
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