What`s in the Air?

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Across
  1. 7. Ar on the periodic table.
  2. 8. He on the periodic table.
  3. 9. O2 on the periodic table.
  4. 10. Ne on the periodic table
  5. 11. An idea or guess about how something works before it happens.
  6. 13. Kr on the periodic table.
  7. 14. N on the periodic table.
  8. 16. Dioxide C02 on the periodic table.
Down
  1. 1. CH4 on the periodic table.
  2. 2. Colorless, odorless mix of nitrogen, oxygen and other gases.
  3. 3. Xe on the periodic table.
  4. 4. The outline, shape or curve of an object.
  5. 5. The science of matter and energy and how they act together.
  6. 6. To move easily in one direction without stopping.
  7. 12. H on the periodic table.
  8. 14. Oxide N2O on the periodic table.
  9. 15. The point where gas begins to combust and burn.