Atomic Theory

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Across
  1. 3. smallest unit of matter
  2. 5. name for columns in Periodic Table
  3. 12. negatively charged parts of atoms
  4. 14. anything that has mass and volume
  5. 15. can be an atom or a molecule
  6. 16. name for rows in Periodic Table
  7. 18. the result of # protons - # electrons
  8. 19. holds protons and neutrons in the center
  9. 20. equals the number of protons
  10. 22. made up of more than one type of atoms
  11. 24. Jello is an example
  12. 25. equals # protons + # neutrons
Down
  1. 1. same element with different # neutrons
  2. 2. made up of only one substance
  3. 4. combination of two or more substances
  4. 6. positively charged parts of atoms
  5. 7. two or more atoms put together
  6. 8. notes # of a type of atom in a molecule
  7. 9. uniform composition
  8. 10. non-uniform composition
  9. 11. have no charge
  10. 13. salad dressing is an example
  11. 17. salt water is an example
  12. 21. notes # of a type of particle
  13. 23. made up of one type of atoms