Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The increase in the atomic radii of the third (5d) series of transition elements is very small, which may be accounted for the filling of ' 
' orbitals before ' 
' orbitals. 
and 
are
X Y
Text Solution
Verified by ExpertsThe correct answer is:
A
According to Aufbau rule, lower energy orbitals filled first as compare to higher energy orbitals. Hence, 4f orbital filled first than 5d orbital.
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