The periodic table and it's trends

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Across
  1. 4. The group farthest to the right on the periodic table
  2. 5. Dioxide What we exhale
  3. 9. Has an atomic number of 78 on the periodic table
  4. 10. What your bones are made of
  5. 13. Element that shares a name with Superman's home planet
  6. 14. The most reactive element on the periodic table
  7. 15. The most chemical element on Earth
Down
  1. 1. used in public pools
  2. 2. What we inhale to breath
  3. 3. Symbol is a K on the periodic table
  4. 6. Symbol is Na on the periodic table
  5. 7. Has the lowest boiling point
  6. 8. The most reactive non-metal chemical family
  7. 11. Forms more compounds than any other element
  8. 12. Symbol is an H on the periodic table