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Among the III A group elements, the diff...

Among the III A group elements, the difference in the atomic radius is large in between 

A

Aluminium and Boron

B

Gallium and Aluminium

C

Thallium and Indium

D

Gallium and Indium

Text Solution

Verified by Experts

The correct Answer is:
A
It is due to greater shielding effect of six p - electrons in Al. In boron, only two 1s - electron show screening effect while in Al eight (two 2s, six , 2p) valence electrons
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