lanthanum
E600124
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| lanthanum canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6534216 — 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: lanthanum Context triple: [lanthanides, startsWithElement, lanthanum]
-
A.
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.
-
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.
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.
-
D.
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.
-
E.
Boron
Boron is a small unincorporated community in Kern County, California, best known for its large open-pit borax mine and its location in the Mojave Desert.
- 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: lanthanum Target entity description: 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.
-
A.
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.
-
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.
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.
-
D.
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.
-
E.
Boron
Boron is a small unincorporated community in Kern County, California, best known for its large open-pit borax mine and its location in the Mojave Desert.
- F. None of above. chosen
Statements (54)
| Predicate | Object |
|---|---|
| instanceOf |
chemical element
ⓘ
lanthanide ⓘ rare-earth metal ⓘ |
| appearance |
silvery-white metal
ⓘ
soft metal ⓘ |
| atomicNumber | 57 ⓘ |
| block | f-block ⓘ |
| boilingPoint | 3737 K ⓘ |
| CASNumber | 7439-91-0 ⓘ |
| chemicalSymbol | La ⓘ |
| crystalStructure | hexagonal close-packed ⓘ |
| densityAtRoomTemperature | 6.15 g/cm³ ⓘ |
| discoveredBy | Carl Gustaf Mosander ⓘ |
| discoveryLocation | Sweden ⓘ |
| discoveryYear | 1839 ⓘ |
| electronegativityPauling | 1.10 ⓘ |
| electronicConfiguration | [Xe] 5d¹ 6s² ⓘ |
| elementCategory |
lanthanide
ⓘ
rare-earth element ⓘ |
| formsOxide | lanthanum(III) oxide ⓘ |
| isBiologicallyNonessential | true ⓘ |
| isDuctile | true ⓘ |
| isMalleable | true ⓘ |
| isModeratelyToxicInHighDoses | true ⓘ |
| isotopes |
lanthanum-138
ⓘ
lanthanum-139 ⓘ |
| isParamagnetic | true ⓘ |
| isSoft | true ⓘ |
| meltingPoint | 1193 K ⓘ |
| mostAbundantIsotope | lanthanum-139 ⓘ |
| mostCommonOxidationState | +3 ⓘ |
| nameOrigin | Greek word "lanthanein" meaning "to lie hidden" ⓘ |
| naturalIsotopeComposition | mostly stable lanthanum-139 with trace radioactive lanthanum-138 ⓘ |
| occursInMineral |
bastnäsite
ⓘ
monazite ⓘ |
| oxidationState | +3 ⓘ |
| oxideFormula | La2O3 ⓘ |
| positionInPeriodicTable |
group 3 (often assigned)
ⓘ
period 6 ⓘ |
| reactsWithWater | true ⓘ |
| series | lanthanide series ⓘ |
| standardAtomicWeight | 138.90547 ⓘ |
| standardState | solid ⓘ |
| tarnishesInAir | true ⓘ |
| uses |
battery electrodes
ⓘ
camera lenses ⓘ carbon arc lamps ⓘ catalysts ⓘ high-refractive-index glass ⓘ hydrogen storage alloys ⓘ nickel–metal hydride batteries ⓘ optical glass ⓘ petroleum cracking catalysts ⓘ polishing powders ⓘ |
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: lanthanum Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.