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Protactinium (91Pa) has no stable isotopes. As 231Pa occurs in usable quantity, and comprises virtually all of the element, it defines the standard atomic weight.
Standards, Protactinium-231 & Protactinium-230
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isotopes decay 231pa half-life protactinium doi atomic mode isotope nuclear 10 11 chemistry 233pa beta also thorium stable 17 230pa
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Isotopes of protactinium | 229Pa | synth | 1.00 | infobox |
| Isotopes of protactinium | 230Pa | synth | 1.00 | infobox |
| Isotopes of protactinium | 231Pa | 100% | 1.00 | infobox |
| Isotopes of protactinium | 232Pa | synth | 1.00 | infobox |
| Isotopes of protactinium | 233Pa | trace | 1.00 | infobox |
| Isotopes of protactinium | 234mPa | trace | 1.00 | infobox |
| Isotopes of protactinium | 234Pa | trace | 1.00 | infobox |
| Isotopes of protactinium | Main isotopes | .mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0… | 1.00 | infobox |
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