Published by:
CGP EDU Academic Team
Published on: August 21, 2026
Generally the atomic and ionic radii increase with increase in atomic number down the group. But the atomic size of aluminium and gallium is almost the same. This is because
A
the nuclear charge of Ga is higher than that of Al
B
gallium contains intervening 
-electrons which do not screen the valence electrons effectively
-electrons which do not screen the valence electrons effectively C
the ionization energies of Ga and Al are comparable
D
all of these.
Text Solution
Verified by ExpertsThe correct answer is:
B
Atomic size of aluminium and gallium is almost the same because gallium contains intervening 
-electrons which do not screen the valence electron effectively.
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