mostly periodic table

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Across
  1. 2. 6th element of the periodic table
  2. 5. 5th element of the periodic table
  3. 7. cold and solid
  4. 8. 4th element of the periodic table
  5. 9. a planet also a periodic table element
  6. 12. has the symbol uuo in the periodic table
Down
  1. 1. 1st element of the periodic table
  2. 3. 7th element of the periodic table
  3. 4. 3rd element of the periodic table
  4. 6. needed to live
  5. 10. has the symbol uub in the periodic table
  6. 11. 2nd element of the periodic table