Question

The number of atoms per unit cell of a bcc lattice is :

• A. $4$
• B. $2$
• C. $1$
• D. $8$

Answer 1

Answer: (B)

$2$

The number of atoms per unit cell of a bcc lattice is $2$.

It has $8$ atoms at the $8$ corners each having $\frac{1}{8}$th contribution.

Therefore, number of atoms $=\frac{1}{8}\times 8=1$

It also has $1$ atoms at the centre which has a full contribution.

Therefore, the total number of atoms in a bcc is $2$.