Process to calculate teh number of atoms per unit cell

The number of atoms per unit cell is equal to the product of 'the number of atoms per basis' and 'the number of basis per unit cell'. In general, if the basis has n number of atoms and the number of basis per unit cell is m, then the number of atoms in the unit cell will be "mn". The number of atoms in the FCC, HCP and diamond unit cells are correspondingly 4, 6, and 8.  Atomic radius