STANDARDChemistry-D & F Block Elements
STANDARD Chemistry Lanthanoid Contraction MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Zr and Hf have almost equal atomic and ionic radii because of
A
diagonal relationship
B
lanthanoid contraction
C
actinoid contraction
D
belonging to the same group
Correct Answer
Option B
Detailed Explanation
The lanthanoid contraction is responsible for the similar atomic and ionic radii of Zr and Hf, as it causes a decrease in atomic size across the lanthanide series.
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