mostly periodic table

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Across
  1. 6. 5th element of the periodic table
  2. 8. needed to live
  3. 9. 18th element of the periodic table
  4. 10. 16th element of the periodic table
  5. 12. has the symbol uub in the periodic table
  6. 16. cold and solid
  7. 18. a planet also a periodic table element
  8. 19. 14th element of the periodic table
  9. 21. 12th element of the periodic table
  10. 22. 11th element of the periodic table
Down
  1. 1. 1st element of the periodic table
  2. 2. 15th element of the periodic table
  3. 3. 13th element of the periodic table
  4. 4. 17th element of the periodic table
  5. 5. 4th element of the periodic table
  6. 7. 6th element of the periodic table
  7. 11. has the symbol uuo in the periodic table
  8. 13. 7th element of the periodic table
  9. 14. 9th element of the periodic table
  10. 15. 3rd element of the periodic table
  11. 17. 2nd element of the periodic table
  12. 20. 10th element of the periodic table