Question

What is the total number of atoms per unit cell in a face-centered cubic structure?

Options

• 6

• 1

• 2

• 4

Answer 1

4

Explanation:

`"8 corners atoms" xx 1/8 "atom per unit cell"` = 1 atom

`"6 face centred atoms" xx 1/2 "atom per unit cell"` = 3 atoms

Total no. of atoms per unit cell = 1 atom + 3 atoms = 4 atoms