Niobium crystallises in body-centred cubic structure. If the atomic radius is 143.1 pm, calculate the density of Niobium. (Atomic mass = 93u).

Explanation

To calculate the density of Niobium (Nb) which crystallizes in a body-centered cubic (BCC) structure, we can follow these steps:

### Step 1: Understand the formula for density
The density (D) of a substance can be calculated using the formula:
\[ D = \frac{Z \times M}{N_A \times a^3} \]
where:
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