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It's Elemental
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[Return to Mendelevium's Data Page]

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

All Known Isotopes of the Element Mendelevium

Mass NumberHalf-lifeDecay ModeBranching Percentage
245900 microsecondsSpontaneous Fission100.00
Alpha Decay0.26
245m0.35 secondsElectron CaptureNo Data Available
Alpha DecayNo Data Available
2461.0 secondsSpontaneous FissionNo Data Available
Alpha Decay> 0.00
Electron Capture> 0.00
2470.38 secondsSpontaneous Fission~ 55.00
Alpha Decay45.00
2487 secondsElectron Capture80.00
Alpha Decay20.00
Spontaneous Fission<= 0.05
24924 secondsAlpha Decay> 60.00
Electron Capture<= 40.00
25052 secondsElectron Capture93.00
Alpha Decay7.00
2514.0 minutesElectron Capture>= 90.00
Alpha Decay<= 10.00
2522.3 minutesElectron Capture<= 100.00
2536 minutesElectron Capture<= 100.00
Alpha DecayNo Data Available
25410 minutesElectron Capture<= 100.00
254m28 minutesElectron Capture<= 100.00
25527 minutesElectron Capture92.00
Alpha Decay8.00
Spontaneous Fission< 0.15
25677 minutesElectron Capture90.80
Alpha Decay9.20
Spontaneous Fission< 3.00
2575.52 hoursElectron Capture85.00
Alpha Decay15.00
Spontaneous Fission< 1.00
25851.5 daysAlpha Decay100.00
Spontaneous FissionNo Data Available
258m57.0 minutesElectron Capture>= 70.00
Spontaneous FissionNo Data Available
25996 minutesSpontaneous Fission~ 100.00
Alpha Decay< 1.30
26031.8 daysSpontaneous Fission>= 42.00
Alpha Decay<= 25.00
Electron Capture<= 23.00
Beta-minus Decay<= 10.00

This page is maintained by Steve Gagnon.

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