How many atoms constitute one unit cell of a face-centred cubic crystal?

In fee (or face-centred cubic) crystal, total number of atoms = the number of atoms contributed from corners

  • the number of atoms contributed from the faces
    = 8 corners X 1/8 atom per corner
  • 6 faces x 1/2 atom per unit face 2
    = 1+3 = 4 atoms