Cool Chemistry Crossword

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Across
  1. 3. K
  2. 5. an element with 1 proton​
  3. 6. Fe​
  4. 8. He
  5. 9. particles with negative charge​
  6. 11. elements that are organized by reactivity​
  7. 13. the model used to illustrate atoms​
  8. 15. H
  9. 18. Xe
  10. 19. Na​
Down
  1. 1. Ca
  2. 2. Ne
  3. 4. Ag​
  4. 5. a name for group 17​
  5. 7. Au​
  6. 10. atomic mass - protons​
  7. 12. S
  8. 14. particles with positive charge​
  9. 16. another term for periods​
  10. 17. He​