The periodic table.

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Across
  1. 4. More expensive than gold.
  2. 6. FE on the periodic table.
  3. 7. Highly radioactive.
  4. 9. O on the periodic table.
  5. 11. Gas that is used to pump up a balloon.
  6. 12. People make jewelry out of it.
  7. 14. Used in pen tips.
  8. 15. It is used in glow sticks.
Down
  1. 1. Cu on the periodic table.
  2. 2. It is in our bones.
  3. 3. A gas that comes from the ground.
  4. 5. Mg on the periodic table.
  5. 8. Good for metabolism and stress.
  6. 10. B on the periodic table.
  7. 11. H on the periodic table.
  8. 13. The most present element in the air.