Niobium crystallizes in body-centred cubic structure. If the density is `8.55 g cm^(-3)`, calculate the atomic radius of niobium using its atomic mass `93 u`.

Explanation

To find the atomic radius of niobium (Nb) which crystallizes in a body-centered cubic (BCC) structure, we can follow these steps:

### Step 1: Understand the relationship between density, molar mass, and atomic volume.
The formula for density (D) is given by:
\[ D = \frac{Z \cdot m}{V \cdot N_A} \]
Where:
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