Question

The number of atoms per unit cell of $bcc$ structure is

• A. 1
• B. 2
• C. 4
• D. 6

Answer 1

Answer: (B)

2

Answer 2

In bec structure,
The number of atoms at corners per unit cell $=\frac{1}{8} \times 8=1$ atom
The number of atoms at body centre per unit cell $=1$ atom
$\therefore$ Total number of atoms per unit cell $=1+1=2$ atoms