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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| protactinium canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11164876 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: protactinium Context triple: [actinide series, containsNaturallyOccurringElements, protactinium]
-
A.
neptunium
Neptunium is a radioactive, synthetic actinide metal and the first transuranium element, used mainly in nuclear research and reactor applications.
-
B.
Plutonium (Ploutonion)
Plutonium (Ploutonion) is an ancient Greco-Roman religious sanctuary and cave at Hierapolis, believed to be an entrance to the underworld and associated with the god Pluto/Hades.
-
C.
nobelium
Nobelium is a synthetic, highly radioactive actinide element with atomic number 102, named in honor of Alfred Nobel and used primarily for scientific research.
-
D.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
-
E.
lawrencium
Lawrencium is a synthetic, highly radioactive actinide element with atomic number 103, used primarily for scientific research in nuclear chemistry and physics.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: protactinium Target entity description: Protactinium is a rare, highly radioactive metallic element in the actinide series, primarily known as an intermediate decay product of uranium in nature.
-
A.
neptunium
Neptunium is a radioactive, synthetic actinide metal and the first transuranium element, used mainly in nuclear research and reactor applications.
-
B.
Plutonium (Ploutonion)
Plutonium (Ploutonion) is an ancient Greco-Roman religious sanctuary and cave at Hierapolis, believed to be an entrance to the underworld and associated with the god Pluto/Hades.
-
C.
nobelium
Nobelium is a synthetic, highly radioactive actinide element with atomic number 102, named in honor of Alfred Nobel and used primarily for scientific research.
-
D.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
-
E.
lawrencium
Lawrencium is a synthetic, highly radioactive actinide element with atomic number 103, used primarily for scientific research in nuclear chemistry and physics.
- F. None of above. chosen
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
ⓘ
linked to:
Kazimierz Fajans
Lise Meitner ⓘ Oswald Helmuth Göhring ⓘ Otto Hahn ⓘ |
| electronConfiguration | [Rn] 5f2 6d1 7s2 ⓘ |
| electronegativityPauling | 1.5 ⓘ |
| foundInMineral |
pitchblende
ⓘ
uraninite ⓘ |
| groupInPeriodicTable | actinides ⓘ |
| hazardClassification | radioactive material ⓘ |
| isotope |
protactinium-231
ⓘ
protactinium-233 ⓘ protactinium-234 ⓘ |
| 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 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: protactinium Description of subject: Protactinium is a rare, highly radioactive metallic element in the actinide series, primarily known as an intermediate decay product of uranium in nature.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.