Question

How many atoms constitute one unit cell of a face centred cubic crystal?

Answer 1

Hey mate !!

8 corners atoms and 6 face atoms.Each corner exists in 8 adjacent cells, so 1/8 of each corner atom is in any particular unit cell. Each face atom exist in 2 adjacent cells, so 1/2 of each face is in any given unit cell. Total atom/Cell = 8 × 1/8 + 6 × 1/2 = 4

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