Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii?

Zr (40) and Hf (72)

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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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Solution

The correct option is A Zr (40) and Hf (72)
Because of lanthanoid contraction, $Z r (40)$ and $H f (72)$ have nearly same atomic radii.

$Element$ $Radius (ppm)$
Zr (40)
145
Hf (72)
144
Ta (73)
134
Ti (22)
132
Nb (41)
134

Hence, option $A$ is correct.

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Similar questions

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

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

Z r (Z = 40)

and

H f (Z = 72)

Q. Zr and Hf have almost equal atomic and ionic radii because of:

Q. Explain why:
Zr and Hf exhibit similar properties.
(At. no. of Zr = 40, Hf = 72)

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$Element$	$Radius (ppm)$
Zr (40)	145
Hf (72)	144
Ta (73)	134
Ti (22)	132
Nb (41)	134

Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii?

The correct option is A Zr (40) and Hf (72)Because of lanthanoid contraction, Zr(40) and Hf(72) have nearly same atomic radii.Element Radius (ppm)Zr (40) 145Hf (72)144Ta (73)134Ti (22) 132Nb (41)134Hence, option A is correct.

The correct option is A Zr (40) and Hf (72)
Because of lanthanoid contraction, $Z r (40)$ and $H f (72)$ have nearly same atomic radii.

$Element$ $Radius (ppm)$
Zr (40)
145
Hf (72)
144
Ta (73)
134
Ti (22)
132
Nb (41)
134

Hence, option $A$ is correct.