Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)
A
Zr(40) and Hf(72)
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B
Zr(40) and Ta(73)
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C
Ti(22) and Zr(40)
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D
Zr(40) and Nb (41)
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Solution
The correct option is A Zr(40) and Hf(72) Zr and Hf have nearly same radii due to lathanoid contraction.