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CGP EDU Academic Team
Published on: August 13, 2026
The lanthanoid contraction is responsible for the fact that (Atomic numbers: 
)
Text Solution
Verified by ExpertsThe correct answer is:
C
A regular decrease in the size of the atoms and ions in lanthanoid series from 
to 
is called lanthanide contraction. The similarity in size of the atoms of Zr and Hf is due to the lanthanide contraction.
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