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Isotopes of the Element Argon

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

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
360.3336%STABLE
380.0629%STABLE
4099.6035%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
3020 nanosecondsProton Emission (suspected)No Data Available
3114.4 millisecondsElectron Capture with
delayed Proton Emission		62.00%
Electron Capture with
delayed Double Proton Emission		8.50%
Electron Capture100.00%
32100.5 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission		35.60%
33173.0 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission		38.70%
34844.5 millisecondsElectron Capture100.00%
351.7756 secondsElectron Capture100.00%
36STABLE--
3735.04 daysElectron Capture100.00%
38STABLE--
39269 yearsBeta-minus Decay100.00%
40STABLE--
41109.61 minutesBeta-minus Decay100.00%
4232.9 yearsBeta-minus Decay100.00%
435.37 minutesBeta-minus Decay100.00%
4411.87 minutesBeta-minus Decay100.00%
4521.48 secondsBeta-minus Decay100.00%
468.4 secondsBeta-minus Decay100.00%
471.23 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission		< 0.20%
48475 millisecondsBeta-minus Decay100.00%
49170 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission		65.00%
5085 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission		35.00%
51> 200 nanosecondsBeta-minus DecayNo Data Available
52> 620 nanosecondsBeta-minus Decay (suspected)No Data Available
53> 620 nanosecondsBeta-minus Decay (suspected)No Data Available
53m620 nanosecondsBeta-minus Decay with
delayed Neutron Emission (suspected)		No Data Available
53m1> 620 nanosecondsBeta-minus Decay with delayed
Double Neutron Emission (suspected)		No Data Available