Atomic Models Corssword Puzzle

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Across
  1. 6. Electrons have a _____ charge
  2. 7. Electrons are ____ than protons and neutrons
  3. 8. Millikan is credited for determining the charge of a(n)____
  4. 13. Democritus believed the universe is made up of tiny particles called
  5. 14. This man is credited for the discovery of the proton
  6. 15. The Planetary model was developed by ____
  7. 16. Electrons are located ____ the nucleus
  8. 17. This man is credited for the discovery of the electron
  9. 18. The plum pudding model is also referred to as the chocolate chip ______
  10. 20. Protons and neutrons have nearly the same ___
Down
  1. 1. The earliest record of atomic theory was developed by this person
  2. 2. John Dalton's theory had this many parts
  3. 3. has a zero charge
  4. 4. Thomson was able to discover the existence of electrons by using a ____ ray tube
  5. 5. Neutral subatomic particle
  6. 7. The planetary model was named because it represents the _____ system
  7. 9. The dense central core of the atom
  8. 10. The charge of an electron was determined through the oil ___ experiment
  9. 11. Neutrons were discovered by this scientist
  10. 12. Positively charged subatomic particle
  11. 19. Protons are located ___ the nucleus