lutetium
E605199
chemical element
isotope of lutetium
lutetium compound
medical radioisotope
radioactive isotope of lutetium
rare earth metal
Lutetium is a dense, silvery-white rare earth metal and the last element in the lanthanide series, used in catalysts, scintillators, and specialized alloys.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Lutetium-175 | 1 |
| lutetium canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6534217 — 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: lutetium Context triple: [lanthanides, endsWithElement, lutetium]
-
A.
lanthanum
Lanthanum is a soft, silvery-white rare-earth metal that serves as the first element of the lanthanide series and is used in applications such as optical glass, catalysts, and battery electrodes.
-
B.
lawrencium
Lawrencium is a synthetic, highly radioactive actinide element with atomic number 103, used primarily for scientific research in nuclear chemistry and physics.
-
C.
lanthanides
Lanthanides are a series of 15 metallic chemical elements from lanthanum to lutetium, known for their similar properties, high reactivity, and key roles in advanced technologies such as magnets, lasers, and electronics.
-
D.
yttrium
Yttrium is a silvery transition metal commonly associated with the rare earth elements and widely used in electronics, lasers, and phosphors for displays and lighting.
-
E.
scandium
Scandium is a soft, silvery-white transition metal (atomic number 21) used in high-performance alloys and lighting, often associated with the rare earth elements.
- 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: lutetium Target entity description: Lutetium is a dense, silvery-white rare earth metal and the last element in the lanthanide series, used in catalysts, scintillators, and specialized alloys.
-
A.
lanthanum
Lanthanum is a soft, silvery-white rare-earth metal that serves as the first element of the lanthanide series and is used in applications such as optical glass, catalysts, and battery electrodes.
-
B.
lawrencium
Lawrencium is a synthetic, highly radioactive actinide element with atomic number 103, used primarily for scientific research in nuclear chemistry and physics.
-
C.
lanthanides
Lanthanides are a series of 15 metallic chemical elements from lanthanum to lutetium, known for their similar properties, high reactivity, and key roles in advanced technologies such as magnets, lasers, and electronics.
-
D.
yttrium
Yttrium is a silvery transition metal commonly associated with the rare earth elements and widely used in electronics, lasers, and phosphors for displays and lighting.
-
E.
scandium
Scandium is a soft, silvery-white transition metal (atomic number 21) used in high-performance alloys and lighting, often associated with the rare earth elements.
- F. None of above. chosen
Statements (55)
| Predicate | Object |
|---|---|
| instanceOf |
chemical element
ⓘ
isotope of lutetium ⓘ lutetium compound ⓘ medical radioisotope ⓘ radioactive isotope of lutetium ⓘ rare earth metal ⓘ |
| appearance | silvery-white metal ⓘ |
| atomicNumber | 71 ⓘ |
| belongsToSeries | rare earth elements ⓘ |
| blockInPeriodicTable | f-block ⓘ |
| boilingPoint | 3402 °C ⓘ |
| CASNumber | 7439-94-3 ⓘ |
| category | transition between lanthanides and 5d transition metals ⓘ |
| chemicalSymbol | Lu ⓘ |
| crystalStructure | hexagonal close-packed ⓘ |
| densityAtRoomTemperature | 9.84 g/cm³ ⓘ |
| discoveredBy |
Carl Auer von Welsbach
ⓘ
Georges Urbain ⓘ |
| electronegativityPauling | 1.27 ⓘ |
| electronicConfiguration | [Xe] 4f14 5d1 6s2 ⓘ |
| formsCompound | lutetium oxide (Lu2O3) ⓘ |
| groupInPeriodicTable | lanthanides ⓘ |
| hardness | relatively hard rare earth metal ⓘ |
| isLastElementOfSeries | lanthanide series ⓘ |
| isotopes |
Lutetium-175
ⓘ
Lutetium-176 ⓘ |
| isStableInAir | slowly tarnishes in air ⓘ |
| magneticOrdering | paramagnetic at room temperature ⓘ |
| meltingPoint | 1663 °C ⓘ |
| mostAbundantIsotope |
Lutetium-175
ⓘ
linked to:
lutetium
|
| mostCommonOxidationState | +3 ⓘ |
| namedAfter |
Lutetia
ⓘ
ancient name of Paris ⓘ |
| naturalOccurrence | primordial ⓘ |
| occursInMineral |
monazite
ⓘ
xenotime ⓘ |
| oxidationState | +3 ⓘ |
| periodInPeriodicTable | 6 ⓘ |
| productionMethod |
ion-exchange separation from rare earth mixtures
ⓘ
solvent extraction from rare earth ores ⓘ |
| radioisotopeUse | Lutetium-177 in targeted cancer therapy ⓘ |
| reactsWith |
acids
ⓘ
halogens ⓘ |
| standardAtomicWeight | 174.9668 ⓘ |
| standardState | solid at 25 °C ⓘ |
| thermalNeutronCaptureCrossSection | high ⓘ |
| use |
Lutetium oxyorthosilicate (LSO) scintillators for PET scanners
ⓘ
catalyst in petroleum cracking ⓘ catalyst in polymerization reactions ⓘ geochronology and geochemical tracing ⓘ radioligand therapy for neuroendocrine tumors ⓘ research in high-temperature superconductors ⓘ scintillator materials ⓘ specialized high-strength alloys ⓘ |
| yearOfDiscovery | 1907 ⓘ |
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: lutetium Description of subject: Lutetium is a dense, silvery-white rare earth metal and the last element in the lanthanide series, used in catalysts, scintillators, and specialized alloys.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.