einsteinium
E99193
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
All labels observed (3)
| Label | Occurrences |
|---|---|
| einsteinium canonical | 4 |
| einsteinium-252 | 1 |
| einsteinium-254 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T854041 — 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: einsteinium Context triple: [Glenn T. Seaborg, discovered, einsteinium]
-
A.
Fermium
Fermium is a synthetic, highly radioactive actinide metal with atomic number 100, first identified in the debris of the first hydrogen bomb test and named in honor of physicist Enrico Fermi.
-
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.
mendelevium
Mendelevium is a synthetic, radioactive actinide element with atomic number 101, named after Dmitri Mendeleev and produced only in particle accelerators.
-
D.
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.
-
E.
Glenn T. Seaborg
Glenn T. Seaborg was an American chemist and Nobel laureate renowned for his work on the discovery of numerous transuranium elements and his leadership in the development of the actinide concept.
- 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: einsteinium Target entity description: Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
-
A.
Fermium
Fermium is a synthetic, highly radioactive actinide metal with atomic number 100, first identified in the debris of the first hydrogen bomb test and named in honor of physicist Enrico Fermi.
-
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.
mendelevium
Mendelevium is a synthetic, radioactive actinide element with atomic number 101, named after Dmitri Mendeleev and produced only in particle accelerators.
-
D.
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.
-
E.
Glenn T. Seaborg
Glenn T. Seaborg was an American chemist and Nobel laureate renowned for his work on the discovery of numerous transuranium elements and his leadership in the development of the actinide concept.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
actinide
ⓘ
chemical element ⓘ synthetic element ⓘ |
| appearance | silvery metal ⓘ |
| atomicNumber | 99 ⓘ |
| atomicRadiusPm | 186 ⓘ |
| belongsTo | periodic table of elements ⓘ |
| belongsToSeries | transuranium elements ⓘ |
| block | f-block ⓘ |
| CASNumber | 7429-92-7 ⓘ |
| chemicalSymbol | Es ⓘ |
| commonOxidationState | +3 ⓘ |
| crystalStructure | face-centered cubic ⓘ |
| density | 8.84 g/cm³ ⓘ |
| discoveredBy |
Albert Ghiorso
ⓘ
Berkeley Lab scientists ⓘ |
| discoveredIn | 1952 ⓘ |
| discoveryContext | debris from the first hydrogen bomb test ⓘ |
| discoveryLocation | University of California, Berkeley ⓘ |
| electronConfiguration | [Rn] 5f11 7s2 ⓘ |
| electronegativityPauling | 1.3 ⓘ |
| elementCategory | actinide ⓘ |
| firstIonizationEnergyKJPerMol | 619 ⓘ |
| group | actinides ⓘ |
| hasNeutronCountInEs-252 | 153 ⓘ |
| hasProtonCount | 99 ⓘ |
| IUPACName | einsteinium ⓘ |
| meltingPointCelsius | 860 ⓘ |
| meltingPointKelvin | 1133 ⓘ |
| mostStableIsotope |
einsteinium-252
ⓘ
linked to:
einsteinium
|
| mostStableIsotopeHalfLife | 471.7 days ⓘ |
| namedAfter | Albert Einstein ⓘ |
| naturalOccurrence |
does not occur naturally on Earth
ⓘ
produced artificially in nuclear reactors ⓘ produced in nuclear explosions ⓘ |
| otherIsotope |
einsteinium-253
ⓘ
einsteinium-254 ⓘ
linked to:
einsteinium
|
| oxidationState |
+2
ⓘ
+3 ⓘ |
| period | 7 ⓘ |
| positionInPeriodicTable | between californium and fermium ⓘ |
| radioactiveHazard |
alpha emitter
ⓘ
gamma emitter ⓘ |
| radioactivity | highly radioactive ⓘ |
| standardAtomicWeight | [252] ⓘ |
| standardState | solid ⓘ |
| thermalNeutronCaptureCrossSection | high ⓘ |
| uses |
production of heavier transuranium elements
ⓘ
scientific research ⓘ |
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: einsteinium Description of subject: Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: einsteinium
linked to: einsteinium