| Atomic Mass | 223 |
|---|---|
| Atomic Number | 87 |
| Name Origins | Named after France |
| Year Discovered | 1939 |
| Discovery Credits | Discovered by Marguerite Perey in Paris, France. |
| Remarks | Intensely radioactive, short lived metal element. Primarily occurs as a trace amount (a few ppm) in uranium or thorium minerals where it is a decay product of uranium and/or thorium. |
| References | Emsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p. |
| See Also | WebElements, ChemiCool |
| Symbol | Isotope Mass | Isotope Nuclide Number | Isotope Number | Natural Abundance | Half-life | Half-life Units | Decay Mode | Decay Mode MeV | Decay Mode % |
|---|---|---|---|---|---|---|---|---|---|
| Fr | 211.99613 | 212 | 87 | Trace | 20 | min. | EC alpha |
5.07 6.529 |
57.0% 43.0% |
| Fr | 223.019733 | 223 | 87 | Trace | 21.8 | min. | beta - | 1.147 | 100.0% |
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