Chemistry

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Across
  1. 2. a special gas used to fill balloons is unable to be burnt
  2. 3. the point of temp which a substance melts
  3. 5. the non metal which has a yellow color
  4. 6. the type of compunds which sodium chloride is in
  5. 9. the type of compounds which co2 is in
  6. 11. the charge of common magnesium ions
  7. 12. h2o
Down
  1. 1. gas with relative atomic mass of 35
  2. 4. each bromine atom has 45
  3. 7. the gas that can be the main cause of global warming
  4. 8. a substance which has one carbon and one oxegen atom in each molecule
  5. 10. the device used for measuring temp