Chemistry Crossword

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Across
  1. 3. opposite of metals
  2. 4. horizontal row
  3. 5. Most stable and unreactive elements
  4. 8. the mass of one atom of an element
  5. 11. react when exposed to air and water
  6. 13. the sum of protons and neutrons in an atom
  7. 15. appearance or state may be altered
  8. 18. neutral particles
  9. 19. sodium chloride
  10. 22. have both metallic and non-metallic properties
  11. 23. vertical column
Down
  1. 1. Anything that has mass and occupies space
  2. 2. most reactive of the metals
  3. 4. made only one kind of matter
  4. 6. Workplace hazardous materials information system
  5. 7. formation of a different substance(s)
  6. 9. red octagon
  7. 10. NaCl
  8. 12. yellow triangle
  9. 14. Most reactive non-metals
  10. 16. positively charged particles
  11. 17. orange diamond
  12. 20. characteristics that describe a substance
  13. 21. shiny, malleable and ductile
  14. 22. a combination of pure substances