Chemistry Crossword

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Across
  1. 3. chemical combination of two or more elements in a specific ratio
  2. 4. a substance that helps a chemical reaction that proceed more quickly
  3. 7. group 18 on the periodic table
  4. 8. substance made of only one kind of matter
  5. 9. an organic catalyst
  6. 12. most reactive non meta
  7. 14. a chemical that releases heat
  8. 16. positively charged particle
  9. 17. a combination of symbols that represent a compound
  10. 18. a reaction that takes place when two or more substances react to make a new substance
  11. 22. negatively charged particle
  12. 23. atomic number 8 on the periodic table
  13. 24. the horizontal column on the periodic table
  14. 25. an atom that has been electrically charged
Down
  1. 1. an element with both metal and non metal properties
  2. 2. most stable and nonreactive elements
  3. 5. the result of a chemical reaction when a new substance is formed
  4. 6. vertical column of elements on the periodic table
  5. 10. two nonmetals combined
  6. 11. slow chemical change that occurs when oxygen in the air reacts with metals
  7. 13. how many protons are in the nucleus
  8. 15. neutral
  9. 19. a chemical reaction that absorbs energy
  10. 20. two metals combined
  11. 21. a solution in which water is the solvent