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Because of lanthanoid contraction,which of the following pairs of elements

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

Options

(a) Zr(40)andNb(41)
(b) Zr(40) and Hf(72)
(c) Zr(40) and Ta(73)
(d) Ti(22) and Zr(40)

Correct Answer:

Zr(40) and Hf(72)

Explanation:

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