Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii ? (Numbers in the parenthesis are atomic numbers).

Zr (40) and Ta (73)

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Ti (22) and Zr (40)

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Zr (40) and Nb (41)

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Zr (40) and Hf (72)

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Solution

The correct option is D
Zr (40) and Hf (72)

Second transition series (145 pm)

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In which of the following sets, elements have nearly same atomic radii?

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