GASES

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Across
  1. 2. _ _ _ _ _-222 can lead to cancer when inhaled
  2. 3. Nitrous _ _ _ _ _ is commonly known as laughing gas
  3. 4. _ _ _ _ _ _ _ Valley is a place in the USA
  4. 7. Dale R. Corson, Kenneth Ross MacKenzie and Emilio Segre first produced it in 1940
  5. 9. Turkey's Eti Mine Company has opened a factory to specifically produce this for others to eat
  6. 10. Carbon _ _ _ _ _ _ _ _ is produced by cars and is one of the major gases contributing to global warming
  7. 12. Murderers extracted it from flypapers to kill their victims
  8. 14. Also known as ozone
  9. 15. Tyrian purple dye, produced by the purple dye murex snail, contains it
  10. 16. The glow of the white solid version of it lead to the word "phosphorescence" being created
  11. 18. In its liquified form, it is brown until it turns blue when it touches starch
  12. 19. It takes up about 78% of the air around us
  13. 20. It is used in excimer lasers
  14. 22. The name of Group 17 on the periodic table
  15. 24. The most electronegative element
  16. 25. The number of gases (including noble gases) in the periodic table
  17. 27. Inhaling it would give your voice a higher pitch
Down
  1. 1. It's name comes from Greek for "the hidden one"
  2. 5. The name of Group 16 on the periodic table
  3. 6. It's used to make a type of tracing paper
  4. 8. Living things need this to respire
  5. 11. Carbon _ _ _ _ _ _ _ is needed for photosynthesis in plants
  6. 12. It has an atomic number of 18
  7. 13. Used to disinfect swimming pools
  8. 16. Another name for the nitrogen family on the periodic table
  9. 17. A name for compounds containing only hydrogen and carbon atoms
  10. 21. When it's liquefied, it can be used as a refrigerant
  11. 23. At room temperature, it's a yellow crystal-like solid
  12. 25. _ _ _ _ _ gases is another name for Group 18 in the Periodic Table
  13. 26. The air around us contains about 0.9_% of argon