If the radius of an atom of an elements is `75` pm and the lattice type is body-centred cubic, what is the edge length of the unit cell?

Explanation

To find the edge length of a body-centered cubic (BCC) unit cell given the radius of an atom, we can use the relationship between the atomic radius (r) and the edge length (a) of the unit cell.

### Step-by-step Solution:

1. **Identify the given values**:
- Radius of the atom (r) = 75 pm (picometers)

2. **Recall the relationship for BCC**:
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