Face Centered Cubic (FCC) Structure contains a total of 4 atoms. Its coordination number is 12. There are one eighth atoms on the corners and half atoms on the six faces and hence total of four.
Answer and Explanation:
On a single face of the cube, we can write the side of the cube " a"as the sum of the radius of the atoms on the face side.
a = R + R for corner atoms + 2R for half size atom on the middle of the face.

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