Across
- 1. is highly reactive
- 4. was named after subterranean German Goblins
- 6. is 100% percent recyclable
- 7. get it's name form a Greek word "Selene" meaning room
- 11. is a solid metal below room temperature
- 12. is an essential element for human nutrition
- 14. is a hard brittle crystalline
- 17. can be found in the earths crust
- 18. is colorless
Down
- 2. around 10% of the mass of the human body is it
- 3. is in the 5th most abundant element in the Earths crust
- 5. is harder than steel
- 8. is odorless
- 9. is the 10th most abundant element in the universe Argon light tubes
- 10. cycle is one of the most important thing of nature
- 13. consists 8.2% of earths crust
- 15. is green yellowish
- 16. is the most electromagnetic of chemicals element