GASES

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