Across
- 2. its smaller than an atom
- 5. proposed the quantum mechanical model
- 9. made the bohr planetary model
- 10. experiment that found the protons
- 12. model a model that has electrons orbiting the nucleus
- 13. discovered electrons
- 14. a theory about atoms
Down
- 1. made atomic theory
- 3. negatively charged subatomic particle
- 4. positively charged particle
- 5. made up of atoms
- 6. equates to the number of protons
- 7. has the protons and neutrons inside
- 8. a neutral subatomic particle
- 11. discovered the protons