periodic table crossword puzzle

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Across
  1. 3. the average mass of on atom of an elements
  2. 4. organizes information about the element and their properties
  3. 6. a particle made of two or more atoms
  4. 8. the smallest particle of an element
  5. 10. a short simple way to describe a chemical reaction
  6. 11. the substance you start with in a chemical reaction
  7. 13. a row across the table
  8. 14. a substance that cannotbe broken down into any other substance
  9. 16. a charateristic that is observed when something changes into a different substance
  10. 19. elements in the same columns
  11. 20. constist of two or more substances
Down
  1. 1. a chemical reaction
  2. 2. an elements is presented by one or two letters
  3. 5. a caracteristic of a subsatance that can be observed without changing the substance
  4. 7. alters the form or apperance of a meterial
  5. 9. material that can be pounded into shapes
  6. 12. the force that holds atoms together
  7. 15. shows the ratio of elements in the compound
  8. 16. asubstance made of two or more elements
  9. 17. an element is the number of protons in the nucleus
  10. 18. a substance formed as a result of a chemical reaction