History of the Atom

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Across
  1. 3. Thomson used cathode rays and how they interacted with matter to discover “negatively charged” particles he called ELECTRON
  2. 6. The paths of electrons in a model based on the amount of energy they possess
  3. 8. Further experimented with Thomson’s model
  4. 11. First began investigating the structure of the atom
  5. 12. Theory of the 4 elements: Earth, Fire, Wind, and Water
  6. 13. Came up with the planetary model
  7. 15. Matter is made of tiny particles called atoms that can’t be subdivided.
Down
  1. 1. states that when elements combine, they do so in the ratio of small whole numbers
  2. 2. Theory Theory in which all matter was divisible to a point where no more division was possible
  3. 4. A compound, no matter what its source, always contains definite, or constant, proportions of its elements by mass
  4. 5. Developed the "atomos" theory
  5. 7. Believed that all matter consisted of 4 elements
  6. 9. As the theory of Quantum Mechanics has developed, it is now believed that electrons exist in an “AREA” not in a specific “path”
  7. 10. Instead of electrons moving in random motion they actually followed a path around the nucleus
  8. 14. English schoolteacher who developed a theory involving the relationship between matter and the atom.