Question

In a face centred cubic cell, what is the contribution of an atom at the face-center?

• A. $1$
• B. $\frac{1}{2}$
• C. $\frac{1}{4}$
• D. $\frac{1}{8}$

Answer 1

Answer: (B)

$\frac{1}{2}$

In face-centered cubic cell, an atom at the face center is shared by $2$ unit cells.
Thus, each point on a corner contributes one half to the unit cell.