Periodic table elements

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Across
  1. 2. pennies are made out of this
  2. 6. we breath this
  3. 7. essential for healthy muscles
  4. 8. is in the earth crust
Down
  1. 1. 78% of earths atmosphere
  2. 2. it has 6 protons
  3. 3. can be in the ocean
  4. 4. its in water
  5. 5. it´s stored in bones