Answer:
(a) In face centred cubic arrangement,
Lattice points located at the corners of the cube = 8
Lattice points located at the centre of each face = 6
Total no. of lattice points = 8 + 6 = 14
(b) In face centred tetragonal, the number of lattice points is also the same i.e., 8 + 6 = 14.
(In both the cases, particles per unit cell = 8 x 1/8 + 6 x 1/2 = 4)
(c) In body centred cubic arrangement,
Lattice points located at the corners of the cube = 8
Lattice points located in the centre of the body = 1
Total no. of lattice points = 8 + 1 = 9
The total number of particles per unit cell = 8 x 1/8 + I = 2.
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