periodic table of the elements

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Across
  1. 1. what is h2o
  2. 4. what is Cu
  3. 6. what are the purple elements
  4. 8. what is Pb
  5. 10. what is Na
  6. 11. what is nickel
  7. 12. what is carbon atomic symbol
  8. 15. what is Al
  9. 17. how many unknown elements are there
  10. 19. what is Ag
  11. 20. how many metals elements are there
Down
  1. 2. how many different elements are there
  2. 3. what is Sc
  3. 5. what is Mo
  4. 7. mass what is the red numbers for
  5. 9. what is Li
  6. 13. what are the elements in pink
  7. 14. what is zinc atomic symbol
  8. 16. what
  9. 18. how many noble gases are there