Periodic Table Crossword Puzzle

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Across
  1. 2. substances cannot be simpler substances
  2. 7. rows going sideways on the periodic table
  3. 8. positive particles
  4. 9. rows going down on the periodic table
  5. 10. group 18 on periodic table
  6. 11. relating to atoms
  7. 13. basic unit of a chemical element
  8. 14. center of atom
  9. 16. atom with a net electric charge
  10. 17. negatively charged
  11. 18. using ions
Down
  1. 1. positively charged ion
  2. 3. anything that isn't a metal
  3. 4. material that is usually solid, conductor
  4. 5. model made by niels bohr
  5. 6. table of organized elements
  6. 12. neutral particles
  7. 15. model made my ernest rutherford