Periodic table

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Across
  1. 3. dioxide you breathe it out
  2. 6. what teeth are made from
  3. 8. swimming pools are cleaned with this
  4. 9. bright lights
Down
  1. 1. bananas are rich in this
  2. 2. what bridges are made from
  3. 4. you breathe it
  4. 5. this is in batteries
  5. 6. a strong bond
  6. 7. canned foods are in this