Chemistry - The Periodic Table (science thingo)

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Across
  1. 2. Silver and ____
  2. 3. Used as a medicine to treat parasites.
  3. 6. An element that is also an American coin.
  4. 10. Used in lightbulbs.
  5. 13. Superman's weakness.
  6. 15. Named after a famous female scientist.
  7. 16. ______ chloride (salt)
  8. 18. Bananas and potatoes are high in this nutrient and element.
Down
  1. 1. Used in toothpaste.
  2. 4. Named after the creator of dynamite.
  3. 5. Named after a Russian Soviet physicist.
  4. 7. The second noble gas in the periodic table.
  5. 8. The most useless ore in Minecraft.
  6. 9. Can form coal and diamonds.
  7. 10. Named after what would've been the 'eigth' planet in the solar system.
  8. 11. Often used in the construction of spacecraft.
  9. 12. Named after a European country.
  10. 14. The softest solid element at room temperature.
  11. 17. Essential for maintaining healthy bones.