Atoms and The Periodic Table

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Across
  1. 4. This man discovered electrons first.
  2. 5. This is the number of protons plus the number of neutrons.
  3. 7. This man found neutrons which have a neutral charge.
  4. 8. This element is represented by the symbol "C"
  5. 10. These are elements with different numbers of neutrons.
  6. 11. These help organize the Periodic Table into horizontal rows.
  7. 14. This man found the nucleus which contains positively charged protons.
Down
  1. 1. These can be found by subtracting the protons from the mass number.
  2. 2. These help organize the Periodic Table into vertical rows.
  3. 3. This gives you the number of protons.
  4. 6. This man showed that electrons move in certain orbits.
  5. 7. This element is represented by the symbol "Cl"
  6. 9. This man began organizing a periodic table around 1869.
  7. 12. This element is represented by the symbol "Na"
  8. 13. Smallest particle of an element.