It's Elemental

Arsenic

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The Periodic Table of Elements

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Bromine

Isotopes of the Element Selenium

[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
740.89%STABLE
769.37%STABLE
777.63%STABLE
7823.77%STABLE
8049.61%STABLE
828.73%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
64> 180 nanosecondsElectron Capture100.00%
6533 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
100.00%
66No Data AvailableNo Data AvailableNo Data Available
67136 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.50%
6835.5 secondsElectron Capture100.00%
6927.4 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.05%
7041.1 minutesElectron Capture100.00%
714.74 minutesElectron Capture100.00%
728.40 daysElectron Capture100.00%
737.15 hoursElectron Capture100.00%
73m39.8 minutesIsomeric Transition72.60%
Electron Capture27.40%
74STABLE--
75119.79 daysElectron Capture100.00%
76STABLE--
77STABLE--
77m17.4 secondsIsomeric Transition100.00%
78STABLE--
792.95×10+5 yearsBeta-minus Decay100.00%
79m3.92 minutesIsomeric Transition99.94%
Beta-minus Decay0.06%
80STABLE--
8118.45 minutesBeta-minus Decay100.00%
81m57.28 minutesIsomeric Transition99.95%
Beta-minus Decay0.05%
82STABLE--
8322.3 minutesBeta-minus Decay100.00%
83m70.1 secondsBeta-minus Decay100.00%
843.26 minutesBeta-minus Decay100.00%
8532.9 secondsBeta-minus Decay100.00%
8614.3 secondsBeta-minus Decay100.00%
875.50 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.20%
881.53 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.67%
890.41 secondsBeta-minus Decay with
delayed Neutron Emission
7.80%
Beta-minus Decay100.00%
90> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
910.27 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
21.00%
92No Data AvailableBeta-minus Decay100.00%
93No Data AvailableBeta-minus Decay100.00%
94> 150 nanosecondsBeta-minus Decay100.00%
95> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
95m300 nanosecondsBeta-minus Decay with
delayed Neutron Emission (suspected)
No Data Available
95m1> 300 nanosecondsBeta-minus Decay with delayed
Double Neutron Emission (suspected)
No Data Available