First slide

Atomic and physical properties

Question

Al and Ga have nearly the same covalent radii, because of

Easy

A

Greater shielding effect of ‘s’ electrons of ‘Ga’ atoms
B

Poor shielding effect of ‘s’ electrons of ‘Ga’ atoms
C

Poor shielding effect of ‘d’ electrons of ‘Ga’ atoms
D

Greater shielding effect of ‘d’ electrons of ‘Ga’ atoms

Solution

Al and Ga have nearly the same covalent radii,
Reason: Al [Ne] 3s² 3p¹
Ga [Ar] 3d¹⁰ 4s² 4p¹
From Al to Ga atomic radii should increase,but atomic size slightly decreases or almost all same .Because the poor shielding effect by the completely filled inner shell 3d¹⁰- electronic configuration in Ga the valency shell electrons are strongly attracted by the nucleus.Hence the size of Ga is slightly less than that of Al or almost all same as that of Al.

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