The History of Atomic Theory

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Across
  1. 2. American physicist, utilized the "oil drop" experiment.
  2. 4. An __________ consists of only one type of atom.
  3. 8. Particle whose mass and charge was calculated using the "oil drop" experiment
  4. 10. James Chadwick discovered __________, the particle whose uncharged masses explained Soddy's discovery.
  5. 13. "Atomos" was derived from the Greek word for __________
  6. 14. The "gold foil" experiment led Rutherford to the discovery of the ___________.
Down
  1. 1. Dalton has _______ postulates to his atomic theory.
  2. 3. Frederick Soddy realized elements could be of different masses, called ___________.
  3. 5. The _______ ray tube used magnets to separate positive and negative particles.
  4. 6. The Law of multiple ___________ states that when two elements react to form more than one compound, a fixed mass of one element will react with masses of the other element in a ratio of small, whole numbers.
  5. 7. Greek philosopher who developed the first theory of the atom.
  6. 9. Late 1800s English physicist who discovered the electron.
  7. 11. A compound consists of atoms of two or more elements combined in a small, whole number _______.
  8. 12. Positive particle produced by radioactive decay.