Periodic Table Elements 1-96 Hard M-F

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