It's Elemental

Hydrogen

Previous Element

(Hydrogen)

The Periodic Table of Elements

Next Element

(Lithium)

Lithium

Isotopes of the Element Helium

[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
30.000134%STABLE
499.999866%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
3STABLE--
4STABLE--
57.595×10-22 secondsNeutron Emission100.00%
Alpha Decay100.00%
6801 millisecondsBeta-minus Decay100.00%
73.038×10-21 secondsNeutron EmissionNo Data Available
8119.1 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
16.00%
9No Data AvailableNeutron Emission100.00%
101.519×10-21 secondsNeutron Emission100.00%