elements and compounds

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Across
  1. 3. element used in bright signs
  2. 4. element symbolized as Ar
  3. 6. element with the atomic number 105
  4. 9. element essential for respiration
  5. 11. compound consisting of oxygen and hydrogen often found in bases
  6. 12. element used in fireworks for red color
Down
  1. 1. triatomic form of oxygen
  2. 2. h20
  3. 3. dioxide pollutant gas with a reddish-brown color
  4. 5. element with the symbol Ge
  5. 7. element with atomic number 12
  6. 8. element used as a disinfectant
  7. 10. element found in table salt
  8. 12. yellow nonmetal element