AP EAPCET 19-Aug-2021 Shift 2 Paper

In face centered cubic unit cell (fcc), each particle is at the comer and at face centeres.
Corner atoms contribute

1

8

per unit cell.
Face center atoms contribute =

1

2

Now, number of atoms, Z=8×

1

8

+6×

1

2

=4
Hence, fcc crystal contains 4 atoms in each unit cell.