Chemistry crossword

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Across
  1. 1. Early 1900's Protons and electrons
  2. 4. New substance formed between 2 reactants
  3. 5. Group 1, unique element
  4. 8. 18 columns
  5. 10. Group of atoms acting as one
  6. 15. defines how many protons an element has
  7. 16. Made up of one type of substance
  8. 20. 1898-1907 British scientist
  9. 24. Early 1900's electron shells
  10. 26. In between non-metals/metals
Down
  1. 2. 1904 planetary model
  2. 3. Greek word- to go or wander
  3. 4. 7 rows
  4. 6. Made up of two or more substances
  5. 7. When a non-metal and metal combine
  6. 9. Most stable non-metals
  7. 11. Chemical combination of two or more elements
  8. 12. When two non-metals combine
  9. 13. Most reactive metals
  10. 14. Anything on the periodic table
  11. 17. 1808 Billiard ball model
  12. 18. The average mass of an element
  13. 19. 1847 raisin bun model
  14. 21. Represents the number of atoms in a chemical formula
  15. 22. 2 or more substances that form a product
  16. 23. Mixture of 2 or more substances that look like one
  17. 25. Most reactive non-metals