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What is rank? Find rank of face centered cubic unit cell.

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 What is rank? Find rank of face centered cubic unit cell. 

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Rank is the number of atoms per unit cell of a crystal. 

In f c c Contribution of atoms present at the corners = 8 x 1/8 -1

Contribution of atoms present at faces  = 6 x 1/2-3

∴ Rank = 1 + 3 = 4.

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