Calculate the no. of particles (atoms) per unit cell in a FCC crystal lattice:

Explanation

(1) A face centre cube contains 8 lattice points at the eight corners and 6 lattice points at the centres of six faces.
+ (2) /A particle present at the corner shares 1/8 of that particle to each unit cell
(3) A particle present at the centre of axx fxxa=ce provides a share of 1/2 of that particle to each unit cell.
(4) The number of particles present in unit cell of fcc `=1/8xx8+1/2xx6=1+3=4`