Periodic Table
Across
- 3. atomic number is 27
- 4. has 69 neutrons
- 6. Colorless, odorless, flammable gas
- 7. The atomic number is 69
- 9. symbol is Hs
- 11. symbol is Ir
- 14. number 88
- 16. Chemical symbol is Rn
- 17. group 2, period 3
- 19. has 28 neutrons
- 21. see 19 across
- 22. atomic number is 8
Down
- 1. symbol is Pd
- 2. group 2, period 13
- 4. hard,silver metal
- 5. soft, silvery white metal
- 8. The atomic number is 81
- 10. Group 4, period 3
- 12. Hf
- 13. Chemical symbol is Pb
- 15. group 6, period 12
- 18. Located in group 4, period 12
- 20. Is the heaviest of the stable halogens
- 23. Has 10 neutrons