Atomic theory crossword

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Across
  1. 3. Negative charge
  2. 4. Classified matter as 4 elements
  3. 5. Law of multiple proportions
  4. 7. Discovered the electron
  5. 8. Basic building block of matter
  6. 10. Heisenberg uncertainty principle
  7. 12. proposed relationship between a quantum of energy and the frequency of radiation.
  8. 15. First modern chemist
  9. 16. introduced idea of electromagnetic radiation has dual wave particle nature
  10. 17. Positive charge
  11. 19. suggested that the structure of atoms are related to electricity
  12. 20. Law of Definite Proportions
  13. 21. concluded there are 2 types of atoms
Down
  1. 1. determined mass of electron
  2. 2. named individual positively charged proton
  3. 6. No charge
  4. 9. added onto Rutherford's ideas
  5. 11. discovered radioactivity
  6. 13. Law of conservation of mass
  7. 14. gold foil experiment
  8. 18. Discovered oxygen