Question

How many lattice points are there in one unit cell of each of the following lattice?

 (i) Face-centred cubic

(ii) Face-centred tetragonal

 (iii) Body-centred 

Answer 1

(i) There are 14 (8 from the corners + 6 from the faces) lattice points in face-centred cubic.

 (ii) There are 14 (8 from the corners + 6 from the faces) lattice points in face-centred tetragonal. 

(iii) There are 9 (1 from the centre + 8 from the corners) lattice points in body-centred cubic.