How many types of centred unit cells exist?

Explanation

To determine how many types of centered unit cells exist, we can analyze the different configurations of atoms within a unit cell. There are three main types of centered unit cells:

1. **Body-Centered Unit Cell (BCC)**:
- In a body-centered unit cell, there is one atom located at the center of the cube, in addition to the atoms located at each of the eight corners of the cube.
- This arrangement means that there is one atom in the center and a contribution of 1/8 of an atom from each of the eight corners, resulting in a total of 2 atoms per unit cell.

2. **Face-Centered Unit Cell (FCC)**:
- In a face-centered unit cell, there is one atom located at the center of each of the six faces of the cube, along with the atoms at the corners.
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