Across
- 2. Atomic mass:137.33
- 3. Xe 4f14 5d2 6s2
- 7. Also a planet
- 9. [Ar] 4s2 3d10 4p3
- 10. Pd
- 13. The most American element
- 16. Most of earth's air
- 17. Pm
- 19. What is the leading component in gunpowder?
- 20. W
Down
- 1. What most bones need to grow
- 4. Atomic mass:210
- 5. What a penny was made of
- 6. Atomic mass:231.0359
- 8. Ar 3d3 4s2
- 11. Kr 4d5 5s1
- 12. what was used in harmful paints and toys
- 14. What is found in most pools
- 15. Xe 4f14 5d7 6s2
- 18. less than 1% of our atmosphere