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What is the coordination number of a face centered cubic (FCC) unit cell?

What is the coordination number of a face centered cubic (FCC) unit cell? Correct Answer 12

In an FCC structure, there are eight atoms, one atom each at the corner of the unit cell and one atom at the centre of each face. For any corner atom of the unit cell, the nearest atoms are face-centred atoms. Thus, the coordination number for an FCC structure = 4 centre atoms below the horizonal plane + 4 centre atoms above the horizontal plane + 4 centre atoms on the horizonal plane. Hence, the coordination number for an FCC structure is 4 + 4 + 4 = 12.

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