Elements of the Periodic Table

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Across
  1. 1. We need this for our strong bones.
  2. 4. The name ____ was derived from the Greek word Argos which means inactive.
  3. 8. Used as a material of jewelry
  4. 10. Composes about 80% of the Earth's inner and outer cores.
  5. 14. It is the most abundant metal on Earth.
  6. 15. A coin is called this as well as an element
  7. 17. Soft enough to be cut through
  8. 18. A planet and an element.
  9. 19. Makes balloons fly
  10. 20. Makes up more than half of the atmosphere's gas.
Down
  1. 2. It makes up for 18% of the human body.
  2. 3. Used to make pools clear
  3. 5. It is the second-lightest noble gas, with helium being the first.
  4. 6. Atomic number 19 (found in bananas)
  5. 7. Sia's number one hit
  6. 9. The most chemically reactive element.
  7. 11. The US coins (dimes, quarters and half-dollars) contained 90% ____ until 1965.
  8. 12. Derives its Name from Latin for Flint.
  9. 13. Superman's weakness
  10. 16. It's the most abundant chemical element.