Periodic Table of Elements

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Across
  1. 4. Found in fossil fuels
  2. 5. Marvel has a superhero with the name ____ - Man
  3. 7. Has the atomic number 39
  4. 12. Used to make stainless steel
  5. 13. Has the atomic number 5
  6. 16. Balloons are filled with this element to make them float
  7. 17. Found in electrical items and plumbing parts
  8. 18. Used in advertisement signs for a bright colored glow
  9. 19. A kitchen foil to keep food fresh
  10. 20. Located in the 3rd period and the 16th group
Down
  1. 1. Has an atomic mass of 87.62
  2. 2. Has the atomic number 33
  3. 3. Found in a compound for table salt
  4. 6. The air humans breathe to stay alive
  5. 8. Has a melting point of 3034°F
  6. 9. Has the atomic mass of 1.00794
  7. 10. Located in the 4th period and 14th group
  8. 11. Makes up about 0.93% of the Earth's atmosphere
  9. 14. Has the atomic mass of 51.996
  10. 15. The most chemically reactive element on the periodic table