How many unit cells are shared by an atom on the face of a unit cell?

Explanation

To solve the question of how many unit cells are shared by an atom on the face of a unit cell, we can break down the problem into clear steps:

### Step-by-Step Solution:

1. **Understanding the Unit Cell**:
A unit cell is the smallest repeating unit in a crystal lattice. It can have atoms located at its corners, faces, and edges.

2. **Identify the Atom on the Face**:
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