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:
- There is 1 atom at the center of the cube and 8 atoms at the corners.
- Each corner atom contributes \( \frac{1}{8} \), so total corner contributions = \( 8 \times \frac{1}{8} = 1 \).
- Adding the center atom, total = \( 1 + 1 = 2 \).
Conclusion: The total number of particles in a BCC unit cell is \( 2 \).