The elements of the periodic table puzzle

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Across
  1. 4. a silver liquid
  2. 5. it was use of currency in the medieval time
  3. 8. it was fond in 2002
  4. 9. is after radium
  5. 11. is in nuke to haha
Down
  1. 1. in balloons
  2. 2. The first on the periodic table
  3. 3. Atomic mass 15.999 u
  4. 6. it make,s origin gas
  5. 7. it in a nuke hehehe
  6. 10. it is in banana