Periodic Table Crossword

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Across
  1. 6. diagram that shows an atom's structure
  2. 8. group 16
  3. 9. group 18
  4. 11. group 1 on the periodic table
  5. 14. vertical columns on the periodic table
  6. 15. # of protons in an atom of an element
  7. 16. solids located to the left of the metalloids
  8. 18. sum of protons and neutrons in an atom's nucleus
  9. 19. group 14
  10. 20. solids with physical properties of metals and chemical properties of nonmetals
Down
  1. 1. group 3-12
  2. 2. group 3
  3. 3. group 17
  4. 4. determine an element's group
  5. 5. group 13
  6. 7. group 18
  7. 10. group 15
  8. 12. horizontal rows
  9. 13. gases or dull, brittle solids located to the right of the metalloids
  10. 17. 1-2 letter(s) that represent an element