Question

Identify unit cell from following having four particles in it

Options

• Body centred cubic 

• Face centred cubic

• Simple cubic 

• Base centred cubic

Answer 1

Face centred cubic

Explanation:

Four particles are contained in a face centred cubic cell, with one particle at each of the corners = `8 xx 1/8 = 1` and three particles on each of the six faces

= `6 xx 1/2 = 3`

Particles in the entire cell = 1 + 3 = 4