| lattice |  |  |  |  |
| name | simple cubic | body-centred cubic | face-centred cubic | hexagonal close-packed |
| coordination number | 6 | 8 | 12 | 12 |
| atoms per unit cell | 8 at corners 8 × 1/8 = 1 | 8 at corners 1 at center 8 × 1/8 + 1 = 2 | 8 at corners 6 at face-centers 8 × 1/8 + 6 × 1/2 = 4 | 8 at corners 1 at center 4 × 1/12 + 4 × 1/6 + 1= 2 |
| percentage of unit cell volume occupied | 52 | 63 | 76 | 76 |
Note that there is no correlation between the number of atoms per unit cell and the density of the packing. The more dense lattices have higher coordination number and a higher percentage of the unit cell occupied by spheres.