What is the correct order of covalent size of the following ?
Nb ______ Ta

Nb = Ta

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Nb < Ta

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Nb > Ta

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None of these.

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Solution

The correct option is D Nb = Ta
The covalent radius, is a measure of the size of an atom that forms part of one covalent bond. Niobium $N b$ (atomic number 41) and tantalum $T a$ (atomic number 73) belongs to same group but both have almost equal covalent size due to lanthanoid contraction.

Hence, the correct option is $A$

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