Periodic Table

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Across
  1. 6. period 7 group 6
  2. 8. what we need to breathe
  3. 9. symbol is Au
  4. 10. Atonic number 92
  5. 11. The noble gas with the least mass
  6. 13. has a neutral charge
  7. 15. all living things have
  8. 18. most reactive alkaline earth metal
  9. 19. Most reactive in group 1
Down
  1. 1. atomic weight of 47.867
  2. 2. pairs with sodium to make salt
  3. 3. Noble gas with weight 39.948
  4. 4. Symbol is U
  5. 5. Has weight 83.798
  6. 6. Lots in Yellowstone
  7. 7. symbol Cu
  8. 12. used to be used in thermometers
  9. 14. Period 4 row 4
  10. 16. Salt
  11. 17. Atomic number 27