Question

In a face centered cubic cell, an atom at the face contributes to the unit cell

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

Answer 1

The correct option is D $\frac{1}{2}$ part

In fcc, an atom at the center is shared by two unit cells.

So, it contributes $\frac{1}{2}$ to each of them.