Chemical Reactions

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Across
  1. 1. a change that can be reversed. no new substance is made
  2. 4. a column in the periodic table
  3. 5. shiny
  4. 6. able to hammered into flat sheets
  5. 12. positively charged particle
  6. 13. the number of protons in the nucleus
  7. 15. _____________ of mass says that the mass in the beginning is the same as the mass at the end
  8. 18. the center of an atom
  9. 21. has a negative charge
  10. 22. able to be made into wires
Down
  1. 2. the same throughout
  2. 3. different throughout
  3. 7. the mass of the protons plus neutrons
  4. 8. 2 or more elements or compounds not chemically combined
  5. 9. breaks easily
  6. 10. 2 or more elements joined together chemically
  7. 11. a change that is irreversible. a new substance is created
  8. 14. the smallest unit of matter
  9. 16. has no charge
  10. 17. the table that contains all of the elements
  11. 19. one kind of atom
  12. 20. a row of the periodic table