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| 91 |
2
9 20 32 18 8 2 |
| Pa <231> |
|
| Protaktiinium |
Protaktiinium on keemiline element järjenumbriga 91.
Kõik protaktiiniumi isotoobid on radioaktiivsed. Pikima elueaga on isotoop massiarvuga 231, mille poolestusaeg on 32 760 aastat. Looduses esineb ka isotoop massiarvuga 234, nimetusega uraan X2, mille poolestusaeg on 6,7 tundi.
Omadustelt on protaktiinium aktinoid.
Tema tihedus normaaltingimustel on 15,37 g/cm3 ja sulamistemperatuur on 1840 Celsiuse kraadi.
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