History of the Atom

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Across
  1. 3. __ _______ is known for his discovery of the electron.
  2. 6. All ______ is made up of atoms
  3. 9. Ernest Rutherford __________ the nucleus and later discovered the protons.
  4. 10. Atoms are the smallest form of matter and have now been discovered to be divided into smaller pieces called _________ atoms.
  5. 11. Although Rutherford discovered the existence of a neutrons in a nucleus, he ______ in finding an exact spot.
  6. 12. J. Chadwick confirmed the existence of ________.
  7. 13. JJ Thomson is also known for his ____ _______ model.
  8. 17. E. Goldstein discovery of canal rays aided in the discovery of _______.
  9. 19. John Dalton used ________ to show atoms exist.
Down
  1. 1. Dalton concluded that gases consist of tiny particles that are in ________ motion
  2. 2. Democritus Coined the term _______.
  3. 4. In J.J. Thomson's model, the idea is that negative electron are _________throughout a "sea" of positive charges.
  4. 5. E. __________ discovered the nucleus.
  5. 7. E. Schrodinger developed a ____ ________ to describe electron motion
  6. 8. N. Bohr determined electrons revolve around a _______.
  7. 9. John ______ reintroduced the idea of an atom years after Democritus.
  8. 14. Rutherford shot a beam of positive _____ particle at thing gold foil.
  9. 15. Rutherford discovered that some elements have a _______ charge.
  10. 16. E. Rutherford created the ____ foil experiment.
  11. 18. A _____ philosopher introduced the idea of an atom