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

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$Z r (40) a n d T a (73)$

$Z r (40) a n d N b (41)$

$Z r (40) a n d H f (72)$

$T i (22) a n d Z r (40)$

answer is A.

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Detailed Solution

Zr and Hf have nearly same atomic radii due to lanthanide contraction.

Element	Radius in ppm
$Z r (40)$	145
$H f (72)$	144
$T a (73)$	134
$T i (22)$	132
$N b (41)$	134

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