| A | B |
|---|
| Heated solid changes to | Liquid |
| Cooled liquid turns to | Solid |
| Particles move freely in this state | Gas |
| Center of atom | Nucleus |
| Part of atom with a positive charge | Proton |
| Change from solid to gas | Sublimation |
| Change from gas to liquid | Condensation |
| Part of atom with no charge | Neutron |
| Part of atom with negative charge | electron |
| Part of atom involved in bonding | valence electron |
| Parts of atom that make up atomic wieght | protons and neutrons |
| part of atom outside of nucleus | electron |
| Measure of how tightly packed something is | Density |
| Measure of how much stuff is there | Mass |
| Measure of how much space something takes up | Volume |
