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How many atoms constitute one unit cell ...

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

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In foc (or face-centred cubic) crystal, total number of atoms
= The number of atoms contributed from corners + The number of atoms contributed from the faces
= 8 corners `xx(1)/(8)` atom per corner + 6 faces `xx(1)/(2)` atom per unit face=1+3= 4 atoms
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