First slide

Atomic and physical properties

Question

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

Easy

A

Aluminium and Boron
B

Gallium and Aluminium
C

Thallium and Indium
D

Gallium and Indium

Solution

B - 1s² 2s² 2p¹
Al -1s² 2s² 2p⁶3s²3p¹
From B to Al as the number of inner shell s and p- orbital electrons increases,shielding effect increases .Since s and p-orbital electrons acts as strong screens hence they can protect the valency electrons from the nucleus effectively,so nuclear forces of attractions on valency electrons decreases,therfore size increases largely from B to Al.

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