Chemistry crossword

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Across
  1. 1. little pieces in the elements
  2. 4. weight of atom
  3. 6. small, simple atom with very few electrons
  4. 8. metal like element that is liquid at room temperature
  5. 10. neutral charged part of atom
  6. 11. reaction that absorbs heat
  7. 13. outermost electron
  8. 14. reaction that releases heat
  9. 16. positive charged piece in an atom
  10. 17. Russian chemist
  11. 20. one or two letters that are used to show an element
  12. 22. outcome of chemical reaction
  13. 23. track that electrons follow
  14. 24. category of elements
Down
  1. 2. shiny and conductive element
  2. 3. a rule that states mass cannot be destroyed
  3. 5. center part of an atom
  4. 7. mixture of non chemically bound elements
  5. 9. a chemical reaction that attaches a metal to the surface of an object
  6. 10. metal non conductive ductile element
  7. 12. number of protons in the nucleus
  8. 15. negative charged part of atom
  9. 18. has atoms in it
  10. 19. solid that causes reaction
  11. 21. pure substance
  12. 22. single element