History of the Atom

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Across
  1. 5. First began investigating the structure of an atom
  2. 8. Developed the Atomos theory
  3. 9. Matter is made of tiny particles called atoms that can’t be subdivided
  4. 10. Further experimented with Thomson's model
  5. 12. A compound always contains definite, or constant proportions of its elements by mass
  6. 14. Not to be cut
  7. 15. Electrons moving around the nucleus like planets revolving around the Sun.
Down
  1. 1. When elements combine,they do so in the ratio of small whole numbers.
  2. 2. More established than Democritus
  3. 3. Model by J.J. Thomson; structure of atom model
  4. 4. As the theory of Quantum Mechanics has developed, it is now believed that electrons exist in an “AREA” not in a specific “path”.
  5. 6. Electron's path according to Niels Bohr
  6. 7. Earth, Fire, Wind, Water
  7. 11. Suggested that instead of electrons moving in random motion that they actually followed a path around the nucleus.
  8. 13. English schoolteacher; Developed theory involving relationships between matter and the Atom.