Question

How many unit particles are present in a BCC (Body-Centered Cubic) unit cell?

• A. 2
• B. 1
• C. 4
• D. 3

Hint:

A BCC unit cell has 1 particle at the center and corner contributions summing up to another particle.

Answer 1

The Correct Option is A

In a BCC unit cell:
- A single atom resides at the cube's center, with eight atoms positioned at the corners.
- Each corner atom accounts for \( \frac{1}{8} \) of its presence, resulting in a total contribution of \( 8 \times \frac{1}{8} = 1 \).
- Including the atom at the center, the cumulative count is \( 1 + 1 = 2 \).
Conclusion: A BCC unit cell contains a total of \( 2 \) particles.