atom/periodic table crossword

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Across
  1. 1. 14 period
  2. 3. 15 groups
  3. 7. 6 atom
  4. 8. 13 chemical.name
  5. 11. 1 oxygen
  6. 12. 8 atomic.number
  7. 13. 3 electron
Down
  1. 1. 2 proton
  2. 2. 12 chemical.symbol
  3. 4. 9 hydrogen
  4. 5. 4 neutron
  5. 6. 11 lithium
  6. 7. 7 atomic.weight
  7. 9. 10 argon
  8. 10. 5 nucleus