Who am I? (Element Version)

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Across
  1. 2. I am the first element on the periodic table.
  2. 4. I have 79 electrons and mass of 197.
  3. 5. You breathe me in, and my atomic number is 8.
  4. 6. I am in group 5 period 5.
  5. 8. My symbol is Pb.
  6. 10. I am an element found in your body with 20 protons.
  7. 12. Symbol for Iron.
  8. 13. I am the element after Gold.
  9. 15. My symbol is "W" because in German my name is Wolfram.
  10. 16. I am the most dangerous element on the table, my symbol is Po.
  11. 17. I am in group 14 period 5.
  12. 18. My symbol is Fe.
Down
  1. 1. I am the fifth element on the periodic table.
  2. 3. I am the second element on the periodic table.
  3. 4. There are 18 total, go up and down.
  4. 5. I have 118 protons in total.
  5. 7. I have 92 protons and am used for submarines.
  6. 9. There are 7 total, go left and right.
  7. 11. I am the most expensive element in Group 1 Period 7.
  8. 14. I am the most explosive element with 51 protons.