Question

The total number of atoms per unit cell of bcc is:

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (B)

$2$

The total number of atoms per unit cell of bcc is 2. In bcc unit cell, one atom is present at body center. It's contribution to the unit cell is 1. 8 atoms are present at 8 corners of the unit cell each corner atom contributes one eight to the unit cell. Hence, net contribution of 8 corner atoms and body center atom is $8\times \frac{1}{8}+1=2$