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Isotopes of the Element Magnesium

[Click for Main Data]         Proton Emission     Neutron Emission     Electron Emission     Positron Emission

Most of the isotope data on this site has been obtained from the National Nuclear Data Center.

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
2478.99%STABLE
2510.00%STABLE
2611.01%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
194.0 picosecondsDouble Proton Emission100.00%
2090.8 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
~ 27.00%
21122 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
32.60%
Electron Capture with
delayed Alpha Decay
< 0.50%
223.8755 secondsElectron Capture100.00%
2311.317 secondsElectron Capture100.00%
24STABLE--
25STABLE--
26STABLE--
279.458 minutesBeta-minus Decay100.00%
2820.915 hoursBeta-minus Decay100.00%
291.30 secondsBeta-minus Decay100.00%
30335 millisecondsBeta-minus Decay100.00%
31232 millisecondsBeta-minus Decay with
delayed Neutron Emission
1.70%
Beta-minus Decay100.00%
3286 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
5.50%
3390.5 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
14.00%
3420 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
No Data Available
3570 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
52.00%
363.9 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
No Data Available
37> 260 nanosecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
No Data Available
38> 260 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
39< 180 nanosecondsNeutron EmissionNo Data Available
40> 170 nanoseconds   Beta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission  
No Data Available