Atomic theory crossword

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