Question

The number of nearest neighbours in a BCC unit cell is:

• A. \( 12 \)
• B. \( 8 \)
• C. \( 6 \)
• D. \( 4 \)

Hint:

In a BCC unit cell, the atom at the center is surrounded by 8 nearest neighbors at the cube’s corners.

Answer 1

The Correct Option is B

In a Body-Centered Cubic (BCC) unit cell, the arrangement consists of: - One atom positioned at the center of the cube,
- Eight atoms placed at the corners of the cube.
The central atom is in contact with the eight corner atoms, making them its nearest neighbors. Therefore, the coordination number of a BCC lattice is \( 8 \).
Other options: - A coordination number of \( 12 \) corresponds to Face-Centered Cubic (FCC) structures.
- A coordination number of \( 6 \) applies to Simple Cubic structures.
- A coordination number of \( 4 \) is not applicable to BCC. Final Answer: \[ \boxed{8} \]