protactinium
E909380
Protactinium is a rare, highly radioactive metallic element in the actinide series, primarily known as an intermediate decay product of uranium in nature.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
actinide
ⓘ
chemical element ⓘ radioactive metal ⓘ |
| appearance | silvery gray metal ⓘ |
| atomicNumber | 91 ⓘ |
| atomicWeight | 231.03588 u ⓘ |
| belongsToSeries | actinide series ⓘ |
| blockInPeriodicTable | f-block ⓘ |
| boilingPoint | about 4000 K ⓘ |
| CASNumber | 7440-13-3 ⓘ |
| chemicalSymbol | Pa ⓘ |
| commonOxidationState | +5 ⓘ |
| crystalStructure | orthorhombic ⓘ |
| density | about 15.37 g/cm³ at 20 °C ⓘ |
| discoveredBy |
Kasimir Fajans
NERFINISHED
ⓘ
Lise Meitner NERFINISHED ⓘ Oswald Helmuth Göhring NERFINISHED ⓘ Otto Hahn NERFINISHED ⓘ |
| electronConfiguration | [Rn] 5f2 6d1 7s2 ⓘ |
| electronegativityPauling | 1.5 ⓘ |
| foundInMineral |
pitchblende
ⓘ
uraninite ⓘ |
| groupInPeriodicTable | actinides ⓘ |
| hazardClassification | radioactive material ⓘ |
| isotope |
protactinium-231
ⓘ
protactinium-233 ⓘ protactinium-234 NERFINISHED ⓘ |
| meltingPoint | about 1572 K ⓘ |
| mostStableIsotope | protactinium-231 ⓘ |
| mostStableIsotopeHalfLife | about 32760 years ⓘ |
| namedAfter | actinium ⓘ |
| nameOrigin | derived from Greek 'protos' meaning 'first' and 'actinium' ⓘ |
| naturalAbundance | extremely low ⓘ |
| occurrence |
intermediate decay product of uranium
ⓘ
naturally occurring ⓘ |
| oxidationState |
+4
ⓘ
+5 ⓘ |
| periodInPeriodicTable | 7 ⓘ |
| positionRelativeToThorium | follows thorium in actinide series ⓘ |
| positionRelativeToUranium | precedes uranium in actinide series ⓘ |
| productionMethod |
extraction from uranium ores
ⓘ
neutron irradiation of thorium ⓘ |
| radioactivity | highly radioactive ⓘ |
| standardState | solid ⓘ |
| storageRequirement | shielded containers ⓘ |
| toxicity | highly toxic ⓘ |
| uses |
scientific research
ⓘ
tracer in geochronology ⓘ |
| yearDiscovered | 1913 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.