Across
- 2. Average mass of atom is:118.710
- 5. Discovered in 1811 by Barnard Courtois
- 6. Symbol: Au
- 8. Where superman was born
- 10. Least dense solid element
- 12. First Noble Gas to form compounds with other elements
- 13. Only 1 proton
- 15. Atomic number is 83
- 16. 3rd most prevalent gas in the Earth's Atmosphere
- 18. Comes from the word Sanskrit "sulvere"
- 20. This element is used to clean pools
- 21. One of the isotopes of this element is crucial for radiocarbon dating
Down
- 1. 1 part of table salt (Starts with S)
- 3. 6th most abundant element in the cosmos
- 4. Makes balloons float
- 7. Only nonmetal liquid at room temperature
- 9. Most protons of any element on the periodic table
- 11. First large-scale application was coating for bearing in WW2
- 14. The "Devils Element"
- 17. What we breath to live
- 19. Group 18, Period 2