Chemistry unit

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Across
  1. 3. thin layer of metal that has been added to the outside of something
  2. 5. smallest amount of a substance
  3. 6. number that represents the number of protons in the nucleus
  4. 7. a combination of molecules
  5. 9. a substance that changes when combined with another substance
  6. 11. negative charge, travels around the nucleus
  7. 12. one or two more electrons on the outer orbital
  8. 14. a substance that is formed by 2 or more chemicals reacting
  9. 15. abbreviation of an element
  10. 16. material that is hard, shiny, malleable and ductile
  11. 17. rows of elements on the Periodic Table
  12. 20. has no electrical charge on the nucleus
  13. 22. mass of an atom
  14. 23. smallest particle of a substance
  15. 24. element whose properties are between those of metals and nonmetals
Down
  1. 1. central part of an atom, is made of protons and neutrons
  2. 2. Russian chemist and inventor
  3. 4. states that matter can be changed from one form into another
  4. 8. column of elements in the Periodic Table
  5. 10. formed with the absorption of heat
  6. 13. substance made of atoms of only one kind
  7. 14. has a positive charge on the nucleus
  8. 18. element that lacks metallic attributes
  9. 19. formed with the evolution of heat
  10. 21. any gas element in group 0(18)