Across
- 2. liquid at room temperature
- 4. Makes up about 21% of our air
- 7. highly radioactive transactinide element
- 11. The most reactive element
- 13. compresses
- 14. atomic number 30
- 15. brittle
- 16. atomic number 31
- 17. has cooling power
- 20. silvery white
Down
- 1. It has the highest melting point
- 3. most abundant element
- 5. is light weight,steel-gray
- 6. very light
- 8. the heaviest known element
- 9. One of the only two metals that aren't silver-colored
- 10. As strong as steel
- 12. first artificially produced element
- 18. rarest naturally occurring element
- 19. It can form over 10 million different compounds