Solid state

Atoms A are present at corners, Atoms A per unit cell=81/8 = 1 If atoms present on one body diagonal are replaced by atom C, then atoms A per unit cell Then 6/8 = 3/4 Atoms B are at centre of each face = 61/2 = 3 Atoms C at corners, atoms C per unit cell will be = 21/8 = 1/4 A B C 3/4 3 1/4 3/44 = 3 34= 12 1/44 = 1