element meitnerium
E159825
Meitnerium is a synthetic, highly radioactive chemical element with atomic number 109, named in honor of physicist Lise Meitner.
All labels observed (2)
| Label | Occurrences |
|---|---|
| element meitnerium canonical | 1 |
| meitnerium | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1388493 — 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: element meitnerium Context triple: [Lise Meitner, hasHonorificEponym, element meitnerium]
-
A.
mendelevium
Mendelevium is a synthetic, radioactive actinide element with atomic number 101, named after Dmitri Mendeleev and produced only in particle accelerators.
-
B.
seaborgium
Seaborgium is a synthetic, highly radioactive transition metal and transactinide element with the symbol Sg and atomic number 106.
-
C.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
-
D.
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.
-
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: element meitnerium Target entity description: Meitnerium is a synthetic, highly radioactive chemical element with atomic number 109, named in honor of physicist Lise Meitner.
-
A.
mendelevium
Mendelevium is a synthetic, radioactive actinide element with atomic number 101, named after Dmitri Mendeleev and produced only in particle accelerators.
-
B.
seaborgium
Seaborgium is a synthetic, highly radioactive transition metal and transactinide element with the symbol Sg and atomic number 106.
-
C.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
-
D.
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.
-
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 |
chemical element
ⓘ
d-block element ⓘ synthetic element ⓘ transactinide element ⓘ transition metal ⓘ |
| atomicNumber | 109 ⓘ |
| atomicWeight | [278] ⓘ |
| belongsTo |
7th period of the periodic table
ⓘ
group 9 elements ⓘ |
| belongsToSeries | platinum group (predicted) ⓘ |
| block | d ⓘ |
| CASNumber | 54038-01-6 ⓘ |
| category | metal ⓘ |
| chemicalSymbol | Mt ⓘ |
| discoveredAt | GSI Helmholtz Centre for Heavy Ion Research ⓘ |
| discoveredIn | Germany ⓘ |
| discoverer |
GSI Darmstadt research team
ⓘ
Gottfried Münzenberg ⓘ Peter Armbruster ⓘ |
| discoveryMethod | cold fusion nuclear reaction ⓘ |
| discoveryYear | 1982 ⓘ |
| electronCount | 109 ⓘ |
| elementCategory | superheavy element ⓘ |
| group | 9 ⓘ |
| hasNoStableIsotopes | true ⓘ |
| isotopes | only radioactive isotopes known ⓘ |
| IUPACName |
element meitnerium
self-linksurface differs
ⓘ
surface form:
meitnerium
|
| mostStableIsotope | meitnerium-278 ⓘ |
| mostStableIsotopeHalfLife | on the order of minutes (approximate) ⓘ |
| namedAfter | Lise Meitner ⓘ |
| namingApprovedBy | IUPAC ⓘ |
| naturalAbundance | 0 ⓘ |
| neutronNumberInMt278 | 169 ⓘ |
| nuclearCharge | +109 ⓘ |
| occurrence | does not occur naturally on Earth ⓘ |
| period | 7 ⓘ |
| phaseAtSTP | unknown ⓘ |
| positionInPeriodicTable | between hassium and darmstadtium ⓘ |
| predictedPhaseAtSTP | solid ⓘ |
| previousSymbol | Une ⓘ |
| previousSystematicName | unnilennium ⓘ |
| primaryUse | scientific research ⓘ |
| productionMethod | particle accelerator synthesis ⓘ |
| projectileInDiscovery | iron-58 ⓘ |
| protonCount | 109 ⓘ |
| radioactivity | highly radioactive ⓘ |
| standardAtomicWeight | [278] ⓘ |
| targetNucleusInDiscovery | bismuth-209 ⓘ |
| uses | no significant practical 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: element meitnerium Description of subject: Meitnerium is a synthetic, highly radioactive chemical element with atomic number 109, named in honor of physicist Lise Meitner.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Meitnerium
this entity surface form:
meitnerium