Find out the number of atoms per unit cell in a face-centred cubic structure having only single atoms at its lattice points.

Explanation

To find the number of atoms per unit cell in a face-centered cubic (FCC) structure, we can follow these steps:

### Step 1: Identify the lattice points in the FCC structure
In a face-centered cubic structure, there are atoms located at:
- The 8 corners of the cube
- The centers of the 6 faces of the cube

### Step 2: Calculate the contribution from corner atoms
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