The atom

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Across
  1. 4. atomic theory pioneer
  2. 7. number of protons
  3. 8. negatively charged particle
  4. 11. atomic mass or collective chemical quanity
  5. 14. mass is not created or destroyed
  6. 16. ratio of elements
  7. 18. decimal value in periodic table
  8. 19. house of the protons and neutrons
Down
  1. 1. experiment by JJ Thomson
  2. 2. number of protons and neutrons
  3. 3. experiment by Ernest Rutherford
  4. 5. he discovered the proton
  5. 6. same number of protons but neutrons vary
  6. 9. used to convert moles to grams
  7. 10. he figured out the charge on the electron
  8. 12. particle in the nucleus
  9. 13. simple whole number ratios
  10. 15. he discovered the electron
  11. 17. smallest particle having properties of element