Symbols For Named Isotopes
The following is a list of isotopes of elements given in the previous tables which have been designated unique symbols. By this it is meant that a comprehensive list of current systematic symbols (in the uAtom form) are not included in the list and can instead be found in the Isotope index chart. Some of the following symbols are no longer in use within the scientific community, however others (most notably some of the named isotopes of hydrogen) continue to be used today. Many of these symbols were designated during the early years of radiochemistry, and several isotopes (namely those in the actinium decay family, the radium decay family, and the thorium decay family) bear placeholder names using the early naming system devised by Ernest Rutherford.
| Chemical Symbol | Name | Atomic Number | Origin of Symbol |
|---|---|---|---|
| Ac | Actinium | 89 | From the Greek aktinos. Name restricted at one time to 227Ac, an isotope of actinium. This named isotope later became the official name for element 89. |
| AcA | Actinium A | 84 | From actinium and A. Placeholder name given at one time to 215Po, an isotope of polonium identified in the decay chain of actinium. |
| AcB | Actinium B | 82 | From actinium and B. Placeholder name given at one time to 211Pb, an isotope of lead identified in the decay chain of actinium. |
| AcC | Actinium C | 83 | From actinium and C. Placeholder name given at one time to 211Bi, an isotope of bismuth identified in the decay chain of actinium. |
| AcC' | Actinium C' | 84 | From actinium and C'. Placeholder name given at one time to 211Po, an isotope of polonium identified in the decay chain of actinium. |
| AcC" | Actinium C" | 81 | From actinium and C". Placeholder name given at one time to 207Tl, an isotope of thallium identified in the decay chain of actinium. |
| AcK | Actinium K | 87 | Name given at one time to 223Fr, an isotope of francium identified in the decay chain of actinium. |
| AcU | Actino-Uranium | 92 | Name given at one time to 235U, an isotope of uranium. |
| AcX | Actinium X | 88 | Name given at one time to 223Ra, an isotope of radium identified in the decay chain of actinium. |
| An | Actinon | 86 | From actinium and emanation. Name given at one time to 219Rn, an isotope of radon identified in the decay chain of actinium. |
| D | Deuterium | 1 | From the Greek deuteros. Name given to 2H. |
| Io | Ionium | 90 | Name given at one time to 230Th, an isotope of thorium identified in the decay chain of uranium. |
| MsTh1 | Mesothorium 1 | 88 | Name given at one time to 228Ra, an isotope of radium. |
| MsTh2 | Mesothorium 2 | 89 | Name given at one time to 228Ac, an isotope of actinium. |
| Pa | Protactinium | 91 | From the Greek protos and actinium. Name restricted at one time to 231Pa, an isotope of protactinium. This named isotope later became the official name for element 91. |
| Ra | Radium | 88 | From the Latin radius. Name restricted at one time to 226Ra, an isotope of radium. This named isotope later became the official name for element 88. |
| RaA | Radium A | 84 | From radium and A. Placeholder name given at one time to 218Po, an isotope of polonium identified in the decay chain of radium. |
| RaB | Radium B | 82 | From radium and B. Placeholder name given at one time to 214Pb, an isotope of lead identified in the decay chain of radium. |
| RaC | Radium C | 83 | From radium and C. Placeholder name given at one time to 214Bi, an isotope of bismuth identified in the decay chain of radium. |
| RaC' | Radium C' | 84 | From radium and C'. Placeholder name given at one time to 214Po, an isotope of polonium identified in the decay chain of radium. |
| RaC" | Radium C" | 81 | From radium and C". Placeholder name given at one time to 210Tl, an isotope of thallium identified in the decay chain of radium. |
| RaD | Radium D | 82 | From radium and D. Placeholder name given at one time to 210Pb, an isotope of lead identified in the decay chain of radium. |
| RaE | Radium E | 83 | From radium and E. Placeholder name given at one time to 210Bi, an isotope of bismuth identified in the decay chain of radium. |
| RaE" | Radium E" | 81 | From radium and E". Placeholder name given at one time to 206Tl, an isotope of thallium identified in the decay chain of radium. |
| RaF | Radium F | 84 | From radium and F. Placeholder name given at one time to 210Po, an isotope of polonium identified in the decay chain of radium. |
| RdAc | Radioactinium | 90 | Name given at one time to 227Th, an isotope of thorium. |
| RdTh | Radiothorium | 90 | Name given at one time to 228Th, an isotope of thorium. |
| Rn | Radon | 86 | From radium and emanation. Name restricted at one time to 222Rn, an isotope of radon identified in the decay chain of radium. This named isotope later became the official name for element 86 in 1923. |
| T | Tritium | 1 | From the Greek tritos. Name given to 3H. |
| Th | Thorium | 90 | After Thor. Name restricted at one time to 232Th, an isotope of thorium. This named isotope later became the official name for element 90. |
| ThA | Thorium A | 84 | From thorium and A. Placeholder name given at one time to 216Po, an isotope of polonium identified in the decay chain of thorium. |
| ThB | Thorium B | 82 | From thorium and B. Placeholder name given at one time to 212Pb, an isotope of lead identified in the decay chain of thorium. |
| ThC | Thorium C | 83 | From thorium and C. Placeholder name given at one time to 212Bi, an isotope of bismuth identified in the decay chain of thorium. |
| ThC' | Thorium C' | 84 | From thorium and C'. Placeholder name given at one time to 212Po, an isotope of polonium identified in the decay chain of thorium. |
| ThC" | Thorium C" | 81 | From thorium and C". Placeholder name given at one time to 208Tl, an isotope of thallium identified in the decay chain of thorium. |
| ThX | Thorium X | 88 | Name given at one time to 224Ra, an isotope of radium identified in the decay chain of thorium. |
| Tn | Thoron | 86 | From thorium and emanation. Name given at one time to 220Rn, an isotope of radon identified in the decay chain of thorium. |
| UI | Uranium I | 92 | Name given at one time to 238U, an isotope of uranium. |
| UII | Uranium II | 92 | Name given at one time to 234U, an isotope of uranium. |
| UX1 | Uranium X1 | 90 | Name given at one time to 234Th, an isotope of thorium identified in the decay chain of uranium. |
| UX2 | Uranium X2 | 91 | Name given at one time to 234Pa, an isotope of protactinium identified in the decay chain of uranium. |
| UY | Uranium Y | 90 | Name given at one time to 231Th, an isotope of thorium identified in the decay chain of uranium. |
| UZ | Uranium Z | 91 | Name given at one time to 234Pa, an isotope of protactinium identified in the decay chain of uranium. |
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