Chemistry guide

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Across
  1. 3. one or more elements combined
  2. 5. in nucleus of an atom, positive charge
  3. 6. same number of electrons and protons
  4. 7. substance that undergoes a chemical change
  5. 8. space outside the nucleus of an atom
  6. 9. two different elements combined
  7. 10. created periodic table
  8. 11. atomic number increases from left to right
  9. 12. outer most orbital
  10. 15. mass of atom in an element
  11. 18. column of elements
  12. 20. the smallest form of matter
  13. 21. energy observed making reaction cooler
  14. 23. regarded as representing something
Down
  1. 1. layer of metal is bonded to the surface of another substance
  2. 2. mix between non metals and metals
  3. 4. principale that matter cannot be created or destroyed
  4. 5. substance obtained from another substance through chemical change
  5. 13. poor conducter of both heat and electricity
  6. 14. substance that can't be chemically broken down
  7. 16. energy released in the form of heat
  8. 17. no charge
  9. 19. gaseous element group 8a or 0
  10. 22. positively charged in center of an atom
  11. 24. substance in its pure state