1. NUMBER OF ATOMS PER UNIT CELL IN A
CUBIC LATTICE
• Simple cubic cell: 1atom/unit cell of sc
e.g. Polonium
• Body-centered cell: 2 atoms/unit cell of bcc
e.g. CsCl, CsBr
• Face-centered cell: 4 atoms/unit cell of fcc
e.g. NaCl, NaF, KBr, MgO
• End face-centered cell: 2 atoms/unit cell

2. No of atoms per unit cell= 8 x 1/8 = 1
Simple Cubic Lattice

3. No of atoms per unit cell= (8 x 1/8) + (1x1) = 2

4. Face-Centered Cubic Lattice
No of atoms present per unit cell
= (8 x 1/8 ) + (6 x 1/2) = 4

5. End Face-Centred Cubic Lattice
No of atoms present per unit cell
= (8 x 1/8 ) + (2 x 1/2) = 2