Across
- 3. can make the most precise of atomic clocks
- 7. has seven distinct allotropes, the most of any metal
- 9. highest specific heat capacity of all elements
- 12. has the highest atomic number of any stable element
- 13. its +3 is the largest of all known tripositive ions
- 14. one of its isotopes is the longest lived confirmed radionuclide
- 16. the only rare earth able to form the +5 oxidation state
- 17. one of its isotopes is the most powerful neutron poison
- 19. the hardest metallic element
- 21. has the highest electrical and thermal conductivity
- 23. has the highest electron affinity
- 28. the least stable element of the first 84
- 29. the lightest element for which all isotopes are radioactive
- 30. highest electronegativity of any non-noble gas
- 31. one of its allotropes is the hardest naturally occurring substance
- 33. the rarest stable metal in the earth's crust
- 35. the densest lanthanide
- 38. has the most solid allotropes of any element
- 43. most corrosion resistant element
- 45. the only naturally occuring element with a fissile isotope
- 46. one of its isomers has the lowest known excitation energy of any isomer
- 47. used for making the alloy with the highest magnetostriction
- 49. the most recently discovered stable element
- 51. one of its isotopes determines the cutoff point for slow neutrons
- 54. the heaviest element to have isotopes that are predicted to be stable rather than observationally stable isotopes that are predicted to be radioactive.
- 57. most abundant element in earth's crust
- 59. almost all of it is radiogenic on earth, but not in the universe
- 60. the last element with a half-life of over a million years
- 62. base metal of the first purposely created alloy
- 64. has the highest magnetic permeability and magnetic saturation of any element
- 65. the shortest-lived radioactive element that has a measured natural atomic mass
- 67. has the highest superconducting temperature of the elemental superconductors
- 68. the only metal that appears in all enzyme classes
- 69. forms a compound with the highest critical temperature of any superconductor, but under extreme pressure
- 71. metallic component of the first organometallic compound known
- 73. most abundant pure element on earth
- 76. the key component of the first discovered superconductor that superconducts above 77 kelvin
- 78. lowest atomic number element to exhibit 10 different oxidation numbers
- 79. has the narrowest liquid range of any element
- 80. the softest of all elements that are solid at room temperature
- 84. the heaviest element having only one incomplete electron shell
- 85. has a disputed, explosive allotrope
- 87. the only element present in amino acids that has some metallic properties at standard conditions
- 88. has an unusual lattice structure compared to the other lanthanides
- 90. the most expensive primordial element
- 92. the most unstable of any element that can occur naturally
- 93. the most biocompatible metal
Down
- 1. the first element used to create a bose-einstein condensate
- 2. the most malleable metal
- 4. in liquid form, it reacts with every crucible material except its own oxide
- 5. the rarest naturally occurring element in earth's crust
- 6. the lighter of the two earliest discovered metals with a recorded discovery date
- 8. the heaviest stable element with a recorded discovery date
- 10. has the lowest boiling point of any stable metal
- 11. has the most complex spectrum of all the elements
- 15. the first non-primordial radioactive element to be isolated
- 18. only monoisotopic element with an even atomic number
- 20. notably can burn in carbon dioxide
- 22. one of its isotopes is the most common radioisotopes in the human body
- 24. one of its isotopes has the highest binding energy per nucleon
- 25. cannot exist as a solid at atmospheric pressure
- 26. has the smallest liquid range of all metals
- 27. has the lowest electronegativity of any d-block element that is not a rare-earth
- 32. the most ductile metal
- 34. the heaviest essential mineral nutrient
- 36. has the longest lived and the only naturally occuring nuclear isomer
- 37. almost exclusively has optical uses involving its pink +3 ion
- 38. the only rare earth metal that Mendeleev predicted
- 39. pure samples known to extrude long screw dislocations
- 40. has 4 oxidation states, all of which form significantly different colors in solution
- 41. the most reactive of the rare earth elements
- 42. the least abundant stable lanthanide
- 44. the most dangerous element, due to its radioactivity
- 48. one of its isotopes has the lowest mass per nucleon
- 50. has the largest number of stable isotopes of any element
- 51. the only rare earth that can form the +4 oxidation state in aqueous solution
- 52. the lightest element to exhibit a sextuple bond
- 53. has the greatest solubility in liquid mercury than any other metal
- 55. only ever exhibits the +2 oxidation state, and only when with the most electronegative of elements
- 56. compounds often violate the octet rule despite its low atomic number
- 58. exhibits the greatest paramagnetic effect of any element
- 61. the only nonmetal that is liquid at room temperature
- 62. the only metal found in a vitamin
- 63. it and its daughter isotopes contribute the most to an individual's background radiation dose, on average
- 66. most abundant metal in earth's crust
- 70. has the highest melting point of all elements
- 72. the lightest element known to exhibit a +8 oxidation state
- 74. has the greatest ratio between melting and boiling point of all elements
- 75. lightest element with an isotope that can produce energy from fission
- 77. the most diamagnetic element known
- 81. forms the most insoluble known sulfate of any element
- 82. most abundant metal in the human body
- 83. has the earliest recorded discovery date
- 86. its extrapolated boiling point would give it the longest liquid range of any element
- 89. one of its isotopes has the largest cross section for the absorption of thermal neutrons
- 91. the densest naturally occuring element known