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What is the total number of atoms per un...

What is the total number of atoms per unit cell in a face-centred cubic (fcc) crystal structures ?

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Contribution by the atoms present at eight corners `=8xx(1)/(8)=1`
Contribution by the atoms present at six face centres `=6xx(1)/(2)=3`
Total number of atoms present in unit cell = 3 + 1 = 4
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