Chemistry - Solid State Question with Solution | TestHub

In a face-centered cubic (fcc) structure, each constituent particle is surrounded by $12$ nearest neighbours.

For a particle at the face centre, it is in contact with $4$ corner atoms in its own plane, $4$ face-centred atoms in the plane above it, and $4$ face-centred atoms in the plane below it.

Thus, the coordination number of a particle in an fcc structure is $12$.

Answer: 12