Question

Total number of metal atoms per unit cell in a face-centred cubic lattice is

• A. 14
• B. 8
• C. 6
• D. 4

Answer 1

Answer: (D)

4

Answer 2

In a fee lattice, Contribution of $8$ atoms at comers $=8\times \frac{1}{8}=1$ Contribution of 6 face centred atoms $=6\times \frac{1}{2}=3$ $\therefore$ Total number of atoms per unit cell $=1+3=4$