Atoms and the Periodic Table

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Across
  1. 5. An organized table of the elements
  2. 7. "AU come back with my _____ watch!"
  3. 9. Element with 3 protons in the nucleus
  4. 14. Subatomic particle with a positive charge
  5. 15. Center of the atom
  6. 16. Halogen found in toothpaste
  7. 17. The name of the vertical column
  8. 18. The electrons found in the outermost energy shell
Down
  1. 1. The charge that electrons have
  2. 2. Element from group 2 that is responsible for strong bones and teeth
  3. 3. Number below the symbol that is a combo of protons and neutrons
  4. 4. subatomic particle with no charge
  5. 6. This tells how many protons are in the atom
  6. 8. Element in group 8 and period 4
  7. 10. Noble gas with only 2 electrons
  8. 11. Name for group 18
  9. 12. Combines with oxygen to make water
  10. 13. Name of the metals in group 1
  11. 14. Horizontal rows that reveal the number of energy levels in an atom