E N D
1. Types of Solids Amorphous solids have no significant long-range order.
Crystalline solids have atoms/ions/molecules arranged in a regular pattern (lattice).
2. Crystal Lattices
The repeating unit of the lattice is called the unit cell.
There are a number of different types of unit cell; hexagonal, rhombic, cubic, etc.
The three types of cubic unit cells are:
simple cubic,
body-centered cubic (bcc),
face-centered cubic (fcc).
3. Cubic Unit Cells