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Isotopes of Radium (click to see decay chain): 202Ra  203Ra  204Ra  205Ra  206Ra  207Ra  208Ra  209Ra  210Ra  211Ra  212Ra  213Ra  214Ra  215Ra  216Ra  217Ra  218Ra  219Ra  220Ra  221Ra  222Ra  223Ra  224Ra  225Ra  226Ra  227Ra  228Ra  229Ra  230Ra  231Ra  232Ra  233Ra  234Ra

231Ra     Half-life Fermion, 88p 143n 1.716666666667 m Spin 5/2 Parity 1 Hide Decay Modes Probability Mode Decay Energy Daughter 100% β- 2.479MeV 231Ac Hide Ultimate Decay Products Yield Nuclide 100.2763136649% 207Pb 8.900000000004×10-8% 205Tl 9.9×10-13% 208Pb Atomic Weight 231.04122 Abundance None Mass Excess 38.396MeV Binding Energy 7.607MeV Magnetic Moment N/A Quadrupole Moment N/A   Show Isotope Symbols. Also show decay chains leading to this isotope. Show all decays, even very low-probability.

Click any isotope in diagram to see its data. Decay chain image generated by Mathematica's GraphPlot and IsotopeData functions from Wolfram Research, Inc..