Periodic Table

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