Chemistry - Solid State Question with Solution | TestHub

In a base-centred (or end-centred) unit cell, particles are present at all $8$ corners and at the centres of $2$ opposite faces.

Contribution of particles at the corners $=8\times \frac{1}{8}=1$

Contribution of particles at the face centres $=2\times \frac{1}{2}=1$

Total number of particles in the unit cell $=1+1=2$

Answer: 2