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Isotopes of the Element Magnesium

[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

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 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available