chemistry crossword

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Across
  1. 8. The "Tiger" that eats through glass.
  2. 9. The invisible security guard in your paper money.
  3. 12. The solid metal that turns to soup in your palm.
  4. 15. The rainbow-salt metal found in asteroid impact layers.
  5. 16. The metal that "screams" when you bend it.
  6. 17. The toxic "Yellow" in an artist's palette.
  7. 18. The heavyweight champion; the densest of them all.
  8. 19. The "Poisoner’s Poison" with a green-twig spectrum.
  9. 20. The Lanthanide that is literally "hard to get."
Down
  1. 1. Rainbow crystals with a half-life longer than the universe.
  2. 2. The 1925 latecomer with a massive melting point.
  3. 3. The element named for the city of Copenhagen.
  4. 4. The tiny ingredient in the world’s strongest magnets.
  5. 5. The metal sponge that "drinks" hydrogen gas.
  6. 6. The "Lead-lookalike" that actually strengthens steel.
  7. 7. The source of "garlic breath" for chemists.
  8. 10. The "Moon" element that conducts better in the light.
  9. 11. The "last" of the rare earths.
  10. 13. The "anti-monk" metal used for ancient eyeliner.
  11. 14. The acid-proof metal named for a thirsty Greek king.