Across
- 2. Ernest Rutherford experiment
- 5. Bohr determined electron simultaneously behaved like waves
- 7. Rutherford discovered the nucleus
- 8. Planetary model
- 9. JJ Thomsons model
- 10. Negatively charged particles
- 12. Coined the term atom
- 13. Discovered positive rays
- 14. Still accepted today
- 15. Aided in the discovery of the protons
- 18. Cathode ray tube
- 19. Developed to describe electron motion
- 20. Meaning indivisible
Down
- 1. Consists of three steps
- 3. Discovery of electrons
- 4. J. Chadwick confirmed existence of neutrons
- 6. Dalton's atomic theory
- 11. Confirmed the existence of neutrons
- 16. Developed wave equation
- 17. Discovered the nucleus