Across
- 2. a unit of energy
- 4. a subatomic particle with a negative electric charge
- 5. a substance that has mass and volume
- 7. a form of electromagnetic radiation
- 8. converting an atom or molecule into an ion
- 9. a basic unit of matter
Down
- 1. the rate of increase speed
- 3. physical bodies attracting each other with force
- 4. the flow of charge
- 6. a nuclear reaction