Elements With No Primordial Isotopes
| Z |
Element |
t1/2 of | Longest lived isotope |
|---|---|---|---|
| 96 | curium | 1.56×107 a | 247Cm |
| 43 | technetium | 4.2×106 a | 98Tc |
| 93 | neptunium | 2.144×106 a | 237Np |
| 91 | protactinium | 32,760 a | 231Pa |
| 95 | americium | 7,370 a | 243Am |
| 88 | radium | 1,602 a | 226Ra |
| 97 | berkelium | 1,380 a | 247Bk |
| 98 | californium | 898 a | 251Cf |
| 84 | polonium | 103 a | 209Po |
| 89 | actinium | 21.77 a | 227Ac |
| 61 | promethium | 17.7 a | 145Pm |
| 99 | einsteinium | 1.29 a | 252Es |
| 100 | fermium | 100.5 d | 257Fm |
| 101 | mendelevium | 51.5 d | 258Md |
| 86 | radon | 3.82 d | 222Rn |
| 105 | dubnium | 1.3 d | 268Db |
| Z |
Element |
t1/2 of | Longest lived isotope |
|---|---|---|---|
| 103 | lawrencium | 10 h | 264Lr |
| 85 | astatine | 8.1 h | 210At |
| 107 | bohrium | 1.5 h | 273Bh |
| 104 | rutherfordium | 1.3 h | 265Rf |
| 106 | seaborgium | 1 h | 272Sg |
| 108 | hassium | 1 h | 276Hs |
| 102 | nobelium | 58 min | 259No |
| 87 | francium | 22.0 min | 223Fr |
| 113 | ununtrium | 20 min | 287Uut |
| 111 | roentgenium | 10 min | 283Rg |
| 109 | meitnerium | 6 min | 279Mt |
| 115 | ununpentium | 1 min | 291Uup |
| 112 | copernicium | 34 s | 285Cn |
| 110 | darmstadtium | 10 s | 278Ds |
| 114 | flerovium | 2.7 s | 289Fl |
| 116 | livermorium | 5.3×10−2 s | 293Lv |
| 117 | ununseptium | 7.8×10−2 s | 294Uus |
| 118 | ununoctium | 8.9×10−4 s | 294Uuo |
Read more about this topic: List Of Elements By Stability Of Isotopes
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