NEET2015Chemistry-Inorganic Chemistry
NEET 2015 Chemistry Lanthanoid Contraction MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)
A
Ti (22) and Zr (40)
B
Zr (40) and Nb (41)
C
Zr (40) and Hf (72)
D
Zr (40) and Ta (73)
Correct Answer
Option B
Detailed Explanation
Lanthanoid contraction causes the atomic radii of Zr and Hf to be nearly the same despite being in different periods.
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