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