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Reference.org
List of nuclides
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<p>This list of nuclides shows observed <a href="/facts/Nuclide/97Ykvzr3">nuclides</a> that either are <a href="/facts/Stable_nuclide/vC0VVvqN">stable</a> or, if radioactive, have half-lives longer than one hour. This includes isotopes of the first 105 elements, except for 87 (<a href="/facts/Francium/P3Rz4gDP">francium</a>), 102 (<a href="/facts/Nobelium/syRkloSw">nobelium</a>) and 104 (<a href="/facts/Rutherfordium/44LSnv9p">rutherfordium</a>). At least 3,300 nuclides have been experimentally characterized - this page presently includes 989. </p>