CHEMISTRY FUN!!!!

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Across
  1. 2. gases that are colorless and odorless and don't like to react with other elements
  2. 7. Substances that contain only one type of atom
  3. 8. this is the largest category of metals
  4. 10. Si
  5. 12. a tiny particle of matter
  6. 14. C
  7. 17. He
  8. 19. O
  9. 20. S
  10. 21. may be from the same element(element molecules),or from different elements (compound molecules)
Down
  1. 1. Aluminum
  2. 2. N
  3. 3. atoms from two or more Different elements that are bonded together to form a new substance
  4. 4. a chemical formula shows how many atoms are present
  5. 5. a heat producing reaction that gets warmer
  6. 6. highly reactive nonmetals that can be dangerous in a pure form
  7. 9. a reaction which absorbs heat that gets cooler
  8. 11. Na
  9. 13. the first element on the Periodic Table
  10. 15. these are the most reactive metals.
  11. 16. a force that holds together two or more atoms
  12. 18. Gold(symbol)
  13. 22. Chlorine(symbol)