Across
- 3. Doesnt react with oxygen & nitrogen
- 5. if you snort or ingest it, you die
- 7. it's 38% denser than air
- 8. added to glasses for green color
- 9. sour taste
- 11. second most abundant element in universe
- 12. predicted by Dmitri Mendelev
- 14. used in mercury vapor lights
- 15. 3rd most abundant element in ocean
- 16. Known by romans and greeks before 20 bc
- 18. been helping with chemotherapy like cancer
- 19. hard to find/identify
Down
- 1. highly reactive
- 2. discovered in 1791
- 4. very unreactive in crystal form
- 6. non magnetic
- 10. discovered in 2000 bc
- 13. discovered around 3500 bc in egypt
- 14. means moon because of its root schene
- 17. in phones and stuff