Atomic Structure and History

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Across
  1. 3. Total number of protons and neutrons
  2. 5. Number of protons
  3. 6. Anything that takes up space
  4. 7. What you can see
  5. 9. Same number of protons, different number of neutrons
  6. 12. Credited for the discovery of the nucleus of an atom
  7. 13. Neutral charge
  8. 14. How much of a given component
  9. 15. A type of change that produces a new substance
  10. 19. Thought atoms were invisible
Down
  1. 1. Credited for the discovery of an electron
  2. 2. Credited for proposing the hypothesis that al matter is composed of atoms
  3. 4. On the periodic table
  4. 5. 6.022e23
  5. 8. Homogeneous or heterogeneous
  6. 10. Created the model we currently use
  7. 11. Positive charge
  8. 16. Two or more elements chemically bonded together
  9. 17. Center of an atom
  10. 18. Negative charge