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Mendelevium

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Isotopes of the Element Nobelium

[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Naturally Occurring Isotopes

Nobelium has no naturally occurring isotopes.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
2482 microsecondsSpontaneous Fission (suspected)No Data Available
249No Data AvailableNo Data AvailableNo Data Available
2504.2 microsecondsSpontaneous Fission100.00%
Alpha Decay< 2.00%
2510.80 secondsAlpha Decay84.00%
Spontaneous Fission< 0.30%
Electron CaptureNo Data Available
251m1.02 secondsAlpha Decay100.00%
2522.47 secondsAlpha Decay70.70%
Spontaneous Fission29.30%
Electron Capture< 1.10%
252m110 millisecondsIsomeric Transition100.10%
2531.62 minutesElectron CaptureNo Data Available
Alpha Decay~ 80.00%
25451 secondsAlpha Decay90.00%
Electron Capture10.00%
Spontaneous Fission0.17%
254m0.28 secondsIsomeric Transition> 80.00%
2553.52 minutesElectron Capture70.00%
Alpha Decay30.00%
2562.91 secondsAlpha Decay99.47%
Spontaneous Fission0.53%
25725 secondsAlpha Decay<= 100.00%
Spontaneous Fission<= 1.50%
2581.2 millisecondsSpontaneous Fission<= 100.00%
25958 minutesAlpha Decay75.00%
Electron Capture25.00%
Spontaneous Fission< 10.00%
260106 millisecondsSpontaneous Fission100.00%
261No Data AvailableAlpha Decay (suspected)No Data Available
262≈ 5 millisecondsSpontaneous Fission100.00%
263No Data AvailableAlpha Decay (suspected)No Data Available
Spontaneous Fission (suspected)No Data Available
264No Data AvailableAlpha Decay (suspected)No Data Available