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Isotopes of the Element Argon

[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
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 nanoseconds   Beta-minus Decay with delayed
Double Neutron Emission (suspected)  
No Data Available