Chemistry Crossword

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Across
  1. 2. a substance that reacts with another substance to make a product
  2. 6. most stable elements on the periodic table
  3. 9. chemical combination of two or more elements
  4. 11. the centre of an atom
  5. 15. colourless, odorless gas which is very deadly
  6. 16. the most reactive metals on the periodic table
  7. 19. the amount of mass in a given volume of a substance
  8. 20. a reaction that takes place when 2 different materials combine to make a new one
  9. 22. the slow reaction that requires oxygen
  10. 23. an atom electrically charged because it has lost or gained electrons
  11. 24. anything that has mass and occupies space
Down
  1. 1. description of an item that can be rolled into thin sheets
  2. 3. a chemical reaction that is sudden and requires oxygen
  3. 4. an irreversible change that creates a new substance
  4. 5. a new substance created when 2 or more reactants react
  5. 6. dull, brittle element that doesn't conduct electricity
  6. 7. the mass of one atom of an element
  7. 8. the most reactive non-metals on the periodic table
  8. 10. the ability for an element to be turned into a wire
  9. 12. the building blocks once called "atomos"
  10. 13. number of protons and electrons in an atom
  11. 14. symbols that represent a compound
  12. 17. element with both metallic and non-metal properties
  13. 18. a neutral particle in a nucleus
  14. 21. a cloudy mixture which cannot be easily separated