Science.

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Across
  1. 6. Element that is a dangerous gas that can enter your house
  2. 7. Ionic that is used in cell batteries.
  3. 8. Covalent that is a strong acid used in fertilizers
  4. 13. Element used in balloons
  5. 14. Ionic that is used to make fireproof materials
Down
  1. 1. Ionic that is a common table salt
  2. 2. Element that we breathe
  3. 3. Element found in LED screens
  4. 4. Ionic used to make soap and clean drains
  5. 5. Covalent that can be used to clean cuts
  6. 9. Element that is radioactive
  7. 10. Covalent used as a cleaning agent
  8. 11. Element used in jet engines
  9. 12. Element used in lasers and fiber optics