The atoms in a face-centered cubic unit cell are located on the corners of a cube and in the centers of the faces

Cubic close-packed planes pass through a face-centered cubic unit cell

Lattice points are located on the corners and in the centers of the faces of a face-centered unit cell

Lattice points in the faces of a face-centered unit cell

Lattice points at the corners of a face-centered cubic unit cell

Metal atoms in a face-centered cubic metal have a coordination number of 12

Lattice points are located on the corners and in the centers of the faces of a face-centered cubic unit cell

One half of an atom is located inside the unit cell in the middle of each face

One eighth of an atom is located inside the unit cell at each corner

6 faces x 1/2 atoms at each face +
8 corners x 1/8 atom at each corner
= 4 atoms per cell