History of Atom

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Across
  1. 3. Matter is made of tiny particles called atoms that can't be subdivided
  2. 4. Believed all matter consisted of 4 elements: Earth,Fire,Wind,and Water
  3. 5. Imagined the electrons moving around the nucleus like planets revolving around the sun
  4. 11. First began investigating the structure of the atom
  5. 12. A compound, no matter what its source always contains definite,or constant,proportions of its elements by mass
  6. 15. Theory that discovered "negatively charged" particles also called ELECTRONS; also assumed there were positively charged particles as well
Down
  1. 1. States that when elements combine,they do so in the ratio of small whole numbers
  2. 2. Suggested that instead of electrons moving in random motion that they actually followed a path around the nucleus
  3. 6. More established than Democritus
  4. 7. Created the Gold Foil Experiment
  5. 8. Electron paths were called "orbitals" based on the amount of energy they possessed
  6. 9. English Teacher; developed a theory involving the relationship between matter and the atom
  7. 10. Developed the "atomos" theory
  8. 13. Believed that electrons exist in an "AREA" not in a specific "path"
  9. 14. Believed all matter was divisible to a point where no more division was possible