Across
- 6. stable subatomic particle (+)
- 7. the 4 ____ forces
- 8. a flow of electrical power or charge
- 9. a type of bomb and energy
- 13. 1st fundamental force
- 15. gravity is a fundamental ___
- 17. chemistry is based on chemical ____
- 18. 2nd fundamental force
- 19. 4th fundamental force
- 20. protons and electrons have positive and negative __
Down
- 1. ____ three laws of motion
- 2. particle that carries the strong force is the ___
- 3. the weak force is responsible for radioactive ____
- 4. 3d fundamental force
- 5. a small portion of matter
- 10. ____ is based on chemical reactions
- 11. the strong force binds _____ together
- 12. a space filling substance
- 14. collection of protons (+) and neutrons (neutral)
- 16. _____ is the most powerful force