The Disappearing Spoon

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Across
  1. 3. The element of which is also a planet of superheroes!
  2. 8. Used to make iPhones.
  3. 9. The Devil is made entirely of this element in "Sold to Satan".
  4. 10. What we breathe in everyday of our lives.
  5. 11. Element atop the Washington Monument.
  6. 12. Element responsible for the death of Robert Falcon Scott.
  7. 13. The element that makes things shine.
  8. 14. Almost sounds like the most populated country in Asia.
  9. 16. Don't confuse this with peanut butter! (Pb).
  10. 18. Sounds like the state under Kentucky.
Down
  1. 1. Last element on the periodic table.
  2. 2. Think of the worst country to live in WW2, then add 'ium'.
  3. 4. Element in poolwater.
  4. 5. Abbreviates to "bro" (a joke).
  5. 6. Element that sounds like you should be washing it off your hands.
  6. 7. Element that makes balloons fly away.
  7. 15. Sounds like a nationality.
  8. 17. The element most associated with creating life on Earth.