Zackery's Crossword Puzzle

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Across
  1. 3. symbol NA
  2. 4. H2O
  3. 6. is a tiny particle but bigger than bacteria
  4. 7. symbol H
  5. 9. are pure substances that cannot be changed
  6. 10. heat and electricity move though them easier
  7. 11. heavy for their size
  8. 12. is the number that comes before the chemical formula
  9. 13. are composed of more than one element
  10. 15. ability to be drawn into a wire
  11. 17. not shiny
  12. 18. is a long whip like structure
Down
  1. 1. having a shiny surface of reflecting light brightly
  2. 2. break or shatter easily
  3. 5. are composed of two or more different substance
  4. 8. heat and electricity do not move through them easily
  5. 12. pure substance
  6. 13. atomic number 17
  7. 14. ability to be hammered into different shapes
  8. 16. are tiny hair like stricter