Q. Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:
A) Diagonal relationship
B) Lanthanoid contraction
C) Having similar chemical properties
D) Belonging to same group
Explanation
[Solution] Lanthanoid contraction offsets the expected size increase from Zr to Hf, making their radii nearly equal. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.