Periodic Table of Elements

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