1. Solids

2. Properties of Solids Particles are moving (vibrating)
Strong attractive forces
Most order
Not fluid

3. Density Particles tightly packed= (usually) most dense form of matter
Water is an exception ice floats because solid water is less dense than liquid water (H bonding in solid form result in particles being further apart than in liquid form)
Increasing pressure does not change volume

4. Crystalline Solids
Particles arranges in an orderly, geometric structure.

5. Unit Cell
The smallest arrangement of atoms in a crystal that has the same symmetry as the whole crystal

7. Categories of Crystalline Solids

8. Amorphous Solids
Particles not arranged in a regular, repeating pattern. (no crystals)
Without shape
Often formed when molten material cools too quickly for crystals to form
Ex: glass, rubber, plastic