thallium (Tl)
E332046
Thallium (Tl) is a soft, highly toxic post-transition metal element used in electronics, optics, and specialized chemical applications.
All labels observed (2)
| Label | Occurrences |
|---|---|
| thallium | 1 |
| thallium (Tl) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3158624 — 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: thallium (Tl) Context triple: [type-I superconductors, includeExample, thallium (Tl)]
-
A.
Albium Ingaunum
Albium Ingaunum was an important ancient Ligurian coastal city, located in what is now Albenga on the Italian Riviera.
-
B.
Vanadium
Vanadium is a hard, silvery-gray transition metal element used in strong alloys and known for imparting green coloration to certain minerals and gemstones.
-
C.
Boric
Boric is the surname of Gabriel Boric, the Chilean politician who became one of the world’s youngest heads of state when he was elected President of Chile.
-
D.
Atombaupreis
The Atombaupreis was a German scientific award recognizing outstanding contributions to nuclear physics and atomic research.
-
E.
Plumbago
Plumbago is a genus of flowering plants known for its ornamental blue or white blooms, commonly grown in warm climates as garden and landscape shrubs.
- 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: thallium (Tl) Target entity description: Thallium (Tl) is a soft, highly toxic post-transition metal element used in electronics, optics, and specialized chemical applications.
-
A.
Albium Ingaunum
Albium Ingaunum was an important ancient Ligurian coastal city, located in what is now Albenga on the Italian Riviera.
-
B.
Vanadium
Vanadium is a hard, silvery-gray transition metal element used in strong alloys and known for imparting green coloration to certain minerals and gemstones.
-
C.
Boric
Boric is the surname of Gabriel Boric, the Chilean politician who became one of the world’s youngest heads of state when he was elected President of Chile.
-
D.
Atombaupreis
The Atombaupreis was a German scientific award recognizing outstanding contributions to nuclear physics and atomic research.
-
E.
Plumbago
Plumbago is a genus of flowering plants known for its ornamental blue or white blooms, commonly grown in warm climates as garden and landscape shrubs.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
chemical element
ⓘ
post-transition metal ⓘ toxic metal ⓘ |
| appearance |
silvery white metal
ⓘ
soft metal ⓘ |
| atomicNumber | 81 ⓘ |
| block | p-block ⓘ |
| boilingPointKelvin | 1746 ⓘ |
| CASNumber | 7440-28-0 ⓘ |
| chemicalSymbol | Tl ⓘ |
| commonCompound |
thallium(I) chloride
ⓘ
thallium(I) sulfate ⓘ thallium(III) oxide ⓘ |
| crystalStructure | hexagonal close-packed ⓘ |
| densityAtRoomTemperature | 11.85 g/cm³ ⓘ |
| discoveredBy |
Claude-Auguste Lamy
ⓘ
William Crookes ⓘ |
| discoveryMethod | spectroscopy ⓘ |
| discoveryYear | 1861 ⓘ |
| electronegativityPauling | 1.62 ⓘ |
| elementCategory |
metal
ⓘ
post-transition metal ⓘ |
| formsOxideLayer | true ⓘ |
| group | 13 ⓘ |
| isCorrosionResistantInAir | low ⓘ |
| isHighlyToxic | true ⓘ |
| isMalleable | true ⓘ |
| isSoft | true ⓘ |
| meltingPointKelvin | 577 ⓘ |
| nameOrigin | Greek word "thallos" meaning green shoot ⓘ |
| oxidationState |
+1
ⓘ
+3 ⓘ |
| period | 6 ⓘ |
| radioisotope | thallium-201 ⓘ |
| radioisotopeUse | myocardial perfusion imaging ⓘ |
| spectralLineColor | green ⓘ |
| standardAtomicWeight | 204.38 ⓘ |
| toxicityTarget |
gastrointestinal system
ⓘ
hair follicles ⓘ nervous system ⓘ |
| use |
electronics
ⓘ
high-refractive-index glass ⓘ infrared optics ⓘ medical imaging radioisotopes ⓘ optics ⓘ radiation detection ⓘ scintillation detectors ⓘ semiconductor materials ⓘ specialized chemical applications ⓘ |
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: thallium (Tl) Description of subject: Thallium (Tl) is a soft, highly toxic post-transition metal element used in electronics, optics, and specialized chemical applications.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: thallium (Tl)