Periodic Table and pH

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1234567891011121314151617181920
Across
  1. 1. A neutral substance (--l-)
  2. 5. This is the name given to raw material known as calcium carbonate
  3. 6. C
  4. 9. N
  5. 12. Cu
  6. 13. A group 1 metal that is more reactive than sodium
  7. 15. The name of a chemical that is in the same group as lithium
  8. 16. Au
  9. 17. Another name for the group 7 elements
  10. 20. A group 2 metal (--g-----m)
Down
  1. 1. Na
  2. 2. H
  3. 3. O
  4. 4. A metal that is extracted by electrolysis
  5. 7. The colour of universal indicator when added to an alkali
  6. 8. This chemical will turn UI a green colour
  7. 10. The colour of UI in hydrochloric acid
  8. 11. A weak alkali that is used in cooking (--k--- ---a)
  9. 12. Ca
  10. 14. A metal ore that needs to be smelted to purify the metal
  11. 18. Li
  12. 19. Zn