Stable Isotope - List of Observationally-stable Isotopes

List of Observationally-stable Isotopes

In the list below, 90 nuclides have no predicted energetically-possible mode of decay, save proton decay. These are unmarked.

Other predicted (but not yet observed) modes of radioactive decay are noted as: A for alpha decay, B for beta decay, BB for double beta decay, E for electron capture, EE for double electron capture, and IT for isomeric transition. Because of the curve of binding energy, all nuclides from Z = 41 (niobium) and beyond, are theoretically unstable with regard to spontaneous fission SF (see list of nuclides for details), and many of the heavier nuclides are theoretically unstable to other processes as well.

  1. Hydrogen-1
  2. Hydrogen-2
  3. Helium-3
  4. Helium-4
  5. Lithium-6
  6. Lithium-7
  7. Beryllium-9
  8. Boron-10
  9. Boron-11
  10. Carbon-12
  11. Carbon-13
  12. Nitrogen-14
  13. Nitrogen-15
  14. Oxygen-16
  15. Oxygen-17
  16. Oxygen-18
  17. Fluorine-19
  18. Neon-20
  19. Neon-21
  20. Neon-22
  21. Sodium-23
  22. Magnesium-24
  23. Magnesium-25
  24. Magnesium-26
  25. Aluminium-27
  26. Silicon-28
  27. Silicon-29
  28. Silicon-30
  29. Phosphorus-31
  30. Sulfur-32
  31. Sulfur-33
  32. Sulfur-34
  33. Sulfur-36
  34. Chlorine-35
  35. Chlorine-37
  36. Argon-36 (EE)
  37. Argon-38
  38. Argon-40
  39. Potassium-39
  40. Potassium-41
  41. Calcium-40 (EE)
  42. Calcium-42
  43. Calcium-43
  44. Calcium-44
  45. Calcium-46 (BB)
  46. Scandium-45
  47. Titanium-46
  48. Titanium-47
  49. Titanium-48
  50. Titanium-49
  51. Titanium-50
  52. Vanadium-51
  53. Chromium-50 (EE)
  54. Chromium-52
  55. Chromium-53
  56. Chromium-54
  57. Manganese-55
  58. Iron-54 (EE)
  59. Iron-56
  60. Iron-57
  61. Iron-58
  62. Cobalt-59
  63. Nickel-58 (EE)
  64. Nickel-60
  65. Nickel-61
  66. Nickel-62
  67. Nickel-64
  68. Copper-63
  69. Copper-65
  70. Zinc-64 (EE)
  71. Zinc-66
  72. Zinc-67
  73. Zinc-68
  74. Zinc-70 (BB)
  75. Gallium-69
  76. Gallium-71
  77. Germanium-70
  78. Germanium-72
  79. Germanium-73
  80. Germanium-74
  81. Arsenic-75
  82. Selenium-74 (EE)
  83. Selenium-76
  84. Selenium-77
  85. Selenium-78
  86. Selenium-80 (BB)
  87. Bromine-79
  88. Bromine-81
  89. Krypton-78 (EE)
  90. Krypton-80
  91. Krypton-82
  92. Krypton-83
  93. Krypton-84
  94. Krypton-86 (BB)
  95. Rubidium-85
  96. Strontium-84 (EE)
  97. Strontium-86
  98. Strontium-87
  99. Strontium-88
  100. Yttrium-89
  101. Zirconium-90
  102. Zirconium-91
  103. Zirconium-92
  104. Zirconium-94 (BB)
  105. Niobium-93 (SF)
  106. Molybdenum-92 (EE)
  107. Molybdenum-94 (SF)
  108. Molybdenum-95 (SF)
  109. Molybdenum-96 (SF)
  110. Molybdenum-97 (SF)
  111. Molybdenum-98 (BB)
    Technetium - No stable isotopes
  112. Ruthenium-96 (EE)
  113. Ruthenium-98 (SF)
  114. Ruthenium-99 (SF)
  115. Ruthenium-100 (SF)
  116. Ruthenium-101 (SF)
  117. Ruthenium-102 (SF)
  118. Ruthenium-104 (BB)
  119. Rhodium-103 (SF)
  120. Palladium-102 (EE)
  121. Palladium-104 (SF)
  122. Palladium-105 (SF)
  123. Palladium-106 (SF)
  124. Palladium-108 (SF)
  125. Palladium-110 (BB)
  126. Silver-107 (SF)
  127. Silver-109 (SF)
  128. Cadmium-106 (EE)
  129. Cadmium-108 (EE)
  130. Cadmium-110 (SF)
  131. Cadmium-111 (SF)
  132. Cadmium-112 (SF)
  133. Cadmium-114 (BB)
  134. Indium-113 (SF)
  135. Tin-112 (EE)
  136. Tin-114 (SF)
  137. Tin-115 (SF)
  138. Tin-116 (SF)
  139. Tin-117 (SF)
  140. Tin-118 (SF)
  141. Tin-119 (SF)
  142. Tin-120 (SF)
  143. Tin-122 (BB)
  144. Tin-124 (BB)
  145. Antimony-121 (SF)
  146. Antimony-123 (SF)
  147. Tellurium-120 (EE)
  148. Tellurium-122 (SF)
  149. Tellurium-123 (E)
  150. Tellurium-124 (SF)
  151. Tellurium-125 (SF)
  152. Tellurium-126 (SF)
  153. Iodine-127 (SF)
  154. Xenon-124 (EE)
  155. Xenon-126 (EE)
  156. Xenon-128 (SF)
  157. Xenon-129 (SF)
  158. Xenon-130 (SF)
  159. Xenon-131 (SF)
  160. Xenon-132 (SF)
  161. Xenon-134 (BB)
  162. Caesium-133 (SF)
  163. Barium-132 (EE)
  164. Barium-134 (SF)
  165. Barium-135 (SF)
  166. Barium-136 (SF)
  167. Barium-137 (SF)
  168. Barium-138 (SF)
  169. Lanthanum-139 (SF)
  170. Cerium-136 (EE)
  171. Cerium-138 (EE)
  172. Cerium-140 (SF)
  173. Cerium-142 (A, BB)
  174. Praseodymium-141 (SF)
  175. Neodymium-142 (SF)
  176. Neodymium-143 (A)
  177. Neodymium-145 (A)
  178. Neodymium-146 (A, BB)
  179. Neodymium-148 (A, BB)
    Promethium - No stable isotopes
  180. Samarium-144 (EE)
  181. Samarium-149 (A)
  182. Samarium-150 (A)
  183. Samarium-152 (A)
  184. Samarium-154 (BB)
  185. Europium-153 (A)
  186. Gadolinium-154 (A)
  187. Gadolinium-155 (A)
  188. Gadolinium-156 (SF)
  189. Gadolinium-157 (SF)
  190. Gadolinium-158 (SF)
  191. Gadolinium-160 (BB)
  192. Terbium-159 (SF)
  193. Dysprosium-156 (A, EE)
  194. Dysprosium-158 (A, EE)
  195. Dysprosium-160 (A)
  196. Dysprosium-161 (A)
  197. Dysprosium-162 (A)
  198. Dysprosium-163 (SF)
  199. Dysprosium-164 (SF)
  200. Holmium-165 (A)
  201. Erbium-162 (A, EE)
  202. Erbium-164 (A, EE)
  203. Erbium-166 (A)
  204. Erbium-167 (A)
  205. Erbium-168 (A)
  206. Erbium-170 (A, BB)
  207. Thulium-169 (A)
  208. Ytterbium-168 (A, EE)
  209. Ytterbium-170 (A)
  210. Ytterbium-171 (A)
  211. Ytterbium-172 (A)
  212. Ytterbium-173 (A)
  213. Ytterbium-174 (A)
  214. Ytterbium-176 (A, BB)
  215. Lutetium-175 (A)
  216. Hafnium-176 (A)
  217. Hafnium-177 (A)
  218. Hafnium-178 (A)
  219. Hafnium-179 (A)
  220. Hafnium-180 (A)
  221. Tantalum-180m (A, B, E, IT)*
  222. Tantalum-181 (A)
  223. Tungsten-182 (A)
  224. Tungsten-183 (A)
  225. Tungsten-184 (A)
  226. Tungsten-186 (A, BB)
  227. Rhenium-185 (A)
  228. Osmium-184 (A, EE)
  229. Osmium-187 (A)
  230. Osmium-188 (A)
  231. Osmium-189 (A)
  232. Osmium-190 (A)
  233. Osmium-192 (A, BB)
  234. Iridium-191 (A)
  235. Iridium-193 (A)
  236. Platinum-192 (A)
  237. Platinum-194 (A)
  238. Platinum-195 (A)
  239. Platinum-196 (A)
  240. Platinum-198 (A, BB)
  241. Gold-197 (A)
  242. Mercury-196 (A, EE)
  243. Mercury-198 (A)
  244. Mercury-199 (A)
  245. Mercury-200 (A)
  246. Mercury-201 (A)
  247. Mercury-202 (A)
  248. Mercury-204 (A, BB)
  249. Thallium-203 (A)
  250. Thallium-205 (A)
  251. Lead-204 (A)
  252. Lead-206 (A)
  253. Lead-207 (A)
  254. Lead-208 (A)

Abbreviations:
A for alpha decay, B for beta decay, BB for double beta decay, E for electron capture, EE for double electron capture, IT for isomeric transition.

* Tantalum-180m is a "metastable isotope" meaning that it is an excited nuclear isomer of Ta-180. See isotopes of tantalum. However, the half life of this nuclear isomer is so long that it has never been observed to decay, and it thus occurs as an "observationally nonradioactive" primordial nuclide, as a minor isotope of tantalum. This is the only case of a nuclear isomer which has a half life so long that it has never been observed to decay. It is thus included in this list.

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