Chemistry Unit Crossword

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Across
  1. 3. Gass element
  2. 5. thing to organize
  3. 6. Russian chemist; helped make periodic law
  4. 9. Number of positive charges
  5. 10. not separated
  6. 11. thing to separate
  7. 12. amount of content
Down
  1. 1. abbreviations of element
  2. 2. electrons
  3. 4. cold
  4. 7. rule
  5. 8. Warm