Question

The total number of atoms per unit cell in $fcc$ is:

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is D $4$

$Fcc$ is face centred cubic packing. Atoms are present at the corners and face centre.
Total no. of atoms in fcc $=8\times \frac{1}{8}+6\times \frac{1}{2}=4$

Option D is correct.