Across
- 2. Discovered in 1735
- 4. is a yellow greenish gaas
- 6. has 6 valance electrons
- 7. rediscovered in 1746
- 9. 2nd Most abundant element in the earths crust
- 11. its named after the us five cent
- 14. Natural state is gas
- 15. was discovered in 3500 BC
- 17. Its highly reactive
- 18. Its on of the few elemnts that can expand when it freezez
- 19. was discovered twice
Down
- 1. It was predicted by a man named Dimitri Mendelev
- 3. Discovered in August 18,1896
- 5. 4th element in the periodic table
- 8. Its from Scandinavia
- 9. Discovered 2000 BC
- 10. Its naturally resisted to corosion
- 12. its unreactive in its crystal form
- 13. It can suffocate becaause of high density
- 16. It doesnt react with oxygen neither hydrogen
- 17. Low levels can cause diabities