Elements - Oskar, Ruby, Olivia, Caleb, Zane

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Across
  1. 5. Needed in your muscles, it is often added to table salt as an additional dietary source
  2. 7. Can form different isotopes, depending on the rate of temperature change
  3. 10. Extraction of this element can be dated back to around 300 BC
  4. 11. Found in ammonia
  5. 12. Does not form oxides until very high temperatures
  6. 13. Name derived from the place it was found; Magnesia, Greece
  7. 14. Soft grey transition metal found in pyrochlore
  8. 16. Commonly used in currency
  9. 17. Rare transitional metal belonging to the platinum group of the periodic table
Down
  1. 1. Not found naturally but easily obtained by smelting
  2. 2. Discovered in Cornwall, Great Britain, in 1791
  3. 3. The lightest gas
  4. 4. Makes up 8% of the Earth's crust
  5. 6. First isolated from potash
  6. 8. Used to make bright red fireworks
  7. 9. The third lightest halogen that forms a red/brown liquid.
  8. 11. An element used to make magnets
  9. 15. Gives a reddish/orange glow in low voltage conditions
  10. 16. Called "Brimstone" in the Bible