Which of the following pair/s have nearly same size?

Z r, H f

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N b, T a

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F e, Z n

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K, R b

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Solution

The correct option is B $N b, T a$
Due to lanthanide contraction, the size of second and third transition series are nearly same. It is due to increase in nulcear charge by 32 units except for Y and La.
$Z r ≃ H f, N b ≃ T a$

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Which of the following pair/s have nearly same size?

The correct option is B Nb, TaDue to lanthanide contraction, the size of second and third transition series are nearly same. It is due to increase in nulcear charge by 32 units except for Y and La. Zr≃Hf, Nb≃Ta

The correct option is B $N b, T a$
Due to lanthanide contraction, the size of second and third transition series are nearly same. It is due to increase in nulcear charge by 32 units except for Y and La.
$Z r ≃ H f, N b ≃ T a$