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Isotopes of the Element Ununpentium

[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

Ununpentium has no naturally occurring isotopes.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
28732 millisecondsAlpha Decay100.00%
28887 millisecondsAlpha Decay100.00%
2890.22 secondsAlpha Decay100.00%
Spontaneous FissionNo Data Available
29016 millisecondsAlpha Decay100.00%
Spontaneous FissionNo Data Available
291No Data AvailableAlpha Decay (suspected)No Data Available
Spontaneous Fission (suspected)No Data Available