The coordination number of the fcc structure for metals is

Options

A. `9`
B. `8`
C. `6`
D. `12`

Answer

4

Explanation

If we consider a face centered atom it has `4` nearest neighbors at the four corners of the unit cell `4` nearest neighbour at the`4` faces center of unit cell on its left. it we consider a corner atoms in fcc lattice , we notice that `3` cystals plane s pass through it ,in each plane it has `4` nearest neighbours at four face centres giving a total at `12` nearest neighbours. alternatively we can say that each atom touches four other in the same layer. four in the layer above it and four in the layer below it.