"The Disappearing Spoon"

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Across
  1. 4. Often referred to as a "dirty bomb" when used in war (C6)
  2. 6. Typically what your pencil markings are made of (C9)
  3. 7. Can either taste sweet or salty (C11)
  4. 8. Shares one electron with a benzene ring, one with a short nitrogen chain and two each with two oxygen atoms (C10)
  5. 9. The element found in sphalerite (C13)
  6. 13. The only element which will bond with gold (C13)
  7. 14. Catalyst to heated nitrogen and hydrogen gas to create air-transmuted ammonia (C5)
  8. 19. Element which has 3 different types on Earth (C4)
  9. 22. Element which will smother flames (C11)
  10. 24. Megaladon teeth were found by the HMS Challenger in 1973 increased in this element (C15)
  11. 26. Used in the bomb on Nagasaki (C6)
  12. 28. An element used in making TV screens (C13)
  13. 29. Only has 7 electrons in its outer energy level (C5)
  14. 31. Element that some people call molly (C5)
  15. 33. Element found in 90% of the outer atmosphere (C4)
  16. 36. Hahn or Meitner (C12)
  17. 37. The Latin name for Copenhagen (C12)
  18. 41. Element name which is Latin for Poland (C12)
  19. 42. The first rare Earth metal (C12)
  20. 43. Tungsten-like additive in aluminum baseball bats (C5)
  21. 45. Element 71 (C12)
Down
  1. 1. A pale, hard-to-melt, insoluble metal which activate the taste buds the same way sugar does (C11)
  2. 2. The drug turned out for L-dopa (C10)
  3. 3. Cracks the crankshaft of sperm's tails (C10)
  4. 4. Natural element found in soil, rocks, coal and mineral fertilizers (C9)
  5. 5. Element found to be tied up in the Earth's molten core (C4)
  6. 10. This element's impact on public health began after 1976 (C10)
  7. 11. Element used for prosthetics (C11)
  8. 12. Sits in the middle of the rare earth row (C10)
  9. 13. Discolors when exposed to air (C9)
  10. 15. The element that completed the puzzle (C6)
  11. 16. Two types of this element can imply projectiles from the solar system (C4)
  12. 17. Table salt (C11)
  13. 18. Element named for the 1903 Nobel Prize winners (C12)
  14. 20. Element used in mustard gas in WW2 (C5)
  15. 21. Colors the skin blue if ingested (C10)
  16. 23. An element hated by Gandhi (C11)
  17. 25. Patients with AIDS lack this element (C15)
  18. 27. Used in alloys like stainless steel (C5)
  19. 30. Similar to selenium and tellurium (C9)
  20. 32. A post-transition, radioactive metal that resembles its lighter siblings of arsenic and antimony (C9)
  21. 34. Element which has similar properties to molybdenum (C5)
  22. 35. Element previously named brevium (C12)
  23. 38. The element found atop the Washington Monument (C13)
  24. 39. The main element people came to the western United States for in 1849 (C13)
  25. 40. Led to wars in the Democratic Republic of Congo (C5)
  26. 44. Known as the stellar metal (C4)