Which of the following pairs of elements have nearly same atomic radii due to lanthanide contraction ? (Numbers in the parenthesis are atomic numbers)

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

$Zr (40) and Hf (72)$

$Zr (40) and Ta (73)$

$Ti (22) and Zr (40)$

$Zr (40) and Nb (41)$

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Zr(40) and Hf(72) have nearly same radii due to lanthanoid contraction.
Between these two elements, Lanthanoids (Z=58-71) are present. In lanthanoids, poor screening of 4f orbitals leads to contraction in size. Due to this, Zr-Hf….Nb-Ta…Mo-W…will have nearly same size.

Watch 3-min video & get full concept clarity

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th