Periodic Table

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Across
  1. 2. I burn with a brilliant white flame
  2. 4. my atomic number is 78
  3. 7. I am a highly flammable gas
  4. 9. I'm 2 elements combined
  5. 10. I'm used to make steel
  6. 12. My atomic number is 27
  7. 15. I'm brittle steel gray
  8. 17. I'm everything on the periodic table
  9. 18. my atomic number is 79
  10. 19. I can form diamonds
  11. 20. A rare radioactive gas
Down
  1. 1. I'm the lightest noble gas
  2. 3. I form 78% of earths atmosphere
  3. 5. I'm used for advertising
  4. 6. A toxic pale green gas
  5. 8. I protect iron and steel from corrosion
  6. 11. My name is also a coin
  7. 13. I'm the air you breath
  8. 14. Used as an electric light
  9. 16. Most common noble gas