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

### Step 1: Understand the given data
- Density (d) of niobium = 8.55 g/cm³
- Atomic mass (m) of niobium = 93 u (which is equivalent to 93 g/mol)
- The number of atoms per unit cell (Z) in BCC = 2

### Step 2: Use the density formula
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