The fcc crystal contains how many atoms in each unit cell? (a) 6 (b) 8 (c) 4 (d) 5
The fcc crystal contains how many atoms in each unit cell?
(a) 6
(b) 8
(c) 4
(d) 5
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Correct option (c) 4
Explanation :
The contribution of eight atoms of face centred cubic unit cell = 8 x 1/8 = 1 atom. There is one atom at each of six faces, which is shared by 2 unit cells each. The contribution of 6 face centred atoms = 6 x 1/2 = 3. Therefore n = 1 + 3 = 4
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