Across
- 4. A lead-antimony alloy is used in batteries
- 5. brilliant reds its salts give to fireworks
- 10. the chemical element of atomic number 18,
- 13. chemical element with the symbol Hs
- 14. cancer therapy.
- 17. scientific study and research.
- 18. heaviest chemical element of Group
- 19. chemical element with the symbol Pb and atomic number 82.
- 21. the chemical element of atomic number 41
Down
- 1. the chemical element of atomic number 6
- 2. the chemical element of atomic number 62,
- 3. chemical element
- 6. keeps a chain reaction under control
- 7. the chemical element of atomic number 83
- 8. he chemical element of atomic number 5,
- 9. flares
- 11. in the manufacture of photocells
- 12. the chemical element of atomic number 16,
- 15. he chemical element of atomic number 7
- 16. the chemical element of atomic number 97
- 20. the chemical element of atomic number 30
