History of the Atom

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Across
  1. 1. Theory stating that each orbital around the nucleus of the atom resembles a fuzzy cloud around the nucleus.
  2. 3. Used cathode rays to discover "negatively charged" particles he called electrons.
  3. 6. He believed all matter consisted of 4 elements: Earth, Fire, Wind, and Water.
  4. 7. Theory that matter is made of tiny particles called atoms that can't be subdivided.
  5. 8. Developed the "atomos" theory.
  6. 10. He developed a theory involving the relationship between matter and the atom. (Atomic Theory)
  7. 13. J.J. Thomson's theory of the atom.
  8. 14. He created the gold foil experiment.
  9. 15. A compound, no matter what its source, always contains definite, or constant, proportions of its elements by mass.
Down
  1. 2. States that when elements combine, they do so in the ratio of small whole numbers.
  2. 4. Theory that was believed by Aristotle.
  3. 5. Theory believed that all matter was divisible to a point where no more division was possible.
  4. 9. Model showing the electron paths called "orbitals" based on the amount of energy they possessed.
  5. 11. He suggested that instead of electrons moving around in random motion that they actually followed a path around the nucleus.
  6. 12. Model in which imagined electrons moving around the nucleus like planets revolving around the sun.