Period table

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Across
  1. 3. 2 or more elements
  2. 8. 1 carbon and 2 oxygen
  3. 9. 48 22 on the periodic table
  4. 10. makes balloons float
Down
  1. 1. You inhale this
  2. 2. good for your teeth
  3. 4. highest on the reactive series
  4. 5. found in sand
  5. 6. found in toothpaste
  6. 7. Na