periodic table crossword

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Across
  1. 2. bond between nonmetals
  2. 4. "columns"
  3. 7. shows how many protons are in an elements atom
  4. 11. determine reactivity
  5. 12. on the staircase
  6. 13. shiny good conductors
  7. 14. that electrons on the outside orbital
  8. 17. group 17
  9. 18. number of ______ determine the element
Down
  1. 1. type of model that is the most accurate that shows that atoms are mostly air
  2. 3. make an atom neutral or not
  3. 5. the smallest particle of an element that retains the elements properties
  4. 6. "rows"
  5. 7. protons plus neutrons
  6. 8. type of model that shows the number of orbitals, nuclei, and electrons
  7. 9. dull brittle mostly gasses
  8. 10. atoms of the same element that have a different number of neutrons
  9. 11. shows valence electrons
  10. 15. a substance that cannot be broken down anymore than it is keeping the same properties
  11. 16. atom with a charge