How many atoms constitute one unit cell of a face-centred cubic crystal?

Explanation

To determine how many atoms constitute one unit cell of a face-centered cubic (FCC) crystal, we can break down the contributions from the atoms located at the corners and the faces of the unit cell.

### Step-by-Step Solution:

1. **Identify the Atoms at the Corners**:
- In a face-centered cubic unit cell, there are 8 corners.
- Each corner atom is shared by 8 adjacent unit cells.
- Therefore, the contribution of each corner atom to the unit cell is \( \frac{1}{8} \).
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