Funky Element Puzzle!

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Across
  1. 3. I have 77 neutrons and am under krypton.
  2. 5. I have 114 neutrons and am in group 14.
  3. 7. The first element on the periodic table.
  4. 10. The symbol of, K
  5. 12. Found at:[5,5]
  6. 13. 5 electrons
  7. 14. A very strong metal, Sia has a song about it
  8. 15. The symbol of, Os
  9. 19. I have 48 neutrons and am bad for Super Man.
  10. 20. The symbol of, Lv
  11. 22. Alex is allergic to me, and I am used in pennies.
Down
  1. 1. the periodic number of 106
  2. 2. I am commonly used in wedding rings.
  3. 4. People like to use this to hide from aliens
  4. 6. Batteries sometimes contain this
  5. 8. Found at:[4,7]
  6. 9. 85 protons
  7. 10. 78 electrons
  8. 11. Used to dress wounds, some people are allergic to it.
  9. 16. I have 120 neutrons and am a transition metal.
  10. 17. Found at:[17,7]
  11. 18. Found at:[8,7]
  12. 21. I am commonly used in bad earrings and coins
  13. 23. The symbol of, Ra