Periodic Table & Atomic Structure

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Across
  1. 3. What is right of the staircase?
  2. 5. Created Lewis dot diagram
  3. 9. What is left of the staircase?
  4. 10. Have same atomic # but different mass #
  5. 11. Is neutral and inside nucleus
  6. 12. Shortened for the name of an element
  7. 13. Created model of an atom
  8. 14. The number o protons in the nucleus of the atom is called...
Down
  1. 1. Located around nucleus
  2. 2. Created element classifications.
  3. 4. Average mass of atoms in an element
  4. 6. Discovered atoms had a nucleus
  5. 7. What is the staircase?
  6. 8. Is positive located inside nucleus