How many lattice points are there in one unit cell of each of the following lattice?
a. Face-centred cubic
b. Face-centred tetragonal
c. Body-centred

Explanation

(i) No. of corner atoms per unit cell = 8 corner atoms x 1/8 atom per unit cell


= 8 x 1/8 = 1 atom


No. of face centred atoms per unit cell = 6 face centred atoms x 1/2 atom per unit cell


= 6 x 1/2 = 3 atoms


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