chemistry

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Across
  1. 7. pure substances
  2. 10. combination of symbols that represent a compound
  3. 12. how much an atom weights(amu)
  4. 14. reversible
  5. 17. positively charged particals
  6. 19. non-reversible
  7. 22. neutral partical in the nucleus of an atom
  8. 23. lost or gain of electrons
  9. 24. vertical columns on the periodic table
Down
  1. 1. gas or liquid
  2. 2. absorbs heat
  3. 3. cloudy mixture, cannot be separated
  4. 4. metalic and non-metalic
  5. 5. group 17 on the periodic table
  6. 6. new substance
  7. 8. substances that react with another
  8. 9. releases heat
  9. 11. non-metal and non-metal
  10. 13. workplace hazardous materials info system
  11. 15. metal and non-metal
  12. 16. the number of protons
  13. 18. group 18 in the periodic table
  14. 19. combination of two or more elements
  15. 20. negative charge
  16. 21. horizontal rows on the periodic table