dubnium
E909428
Dubnium is a synthetic, highly radioactive transactinide chemical element with atomic number 105, named after the Russian research town of Dubna where it was first studied.
All labels observed (9)
| Label | Occurrences |
|---|---|
| dubnium canonical | 4 |
| dubnium-268 | 2 |
| dubnium-255 | 1 |
| dubnium-256 | 1 |
| dubnium-257 | 1 |
| dubnium-260 | 1 |
| dubnium-261 | 1 |
| dubnium-263 | 1 |
| unnilpentium | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11196857 — 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: dubnium Context triple: [Dubna, associatedWithElement, dubnium]
-
A.
seaborgium
Seaborgium is a synthetic, highly radioactive transition metal and transactinide element with the symbol Sg and atomic number 106.
-
B.
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.
-
C.
mendelevium
Mendelevium is a synthetic, radioactive actinide element with atomic number 101, named after Dmitri Mendeleev and produced only in particle accelerators.
-
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.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
- 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: dubnium Target entity description: Dubnium is a synthetic, highly radioactive transactinide chemical element with atomic number 105, named after the Russian research town of Dubna where it was first studied.
-
A.
seaborgium
Seaborgium is a synthetic, highly radioactive transition metal and transactinide element with the symbol Sg and atomic number 106.
-
B.
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.
-
C.
mendelevium
Mendelevium is a synthetic, radioactive actinide element with atomic number 101, named after Dmitri Mendeleev and produced only in particle accelerators.
-
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.
einsteinium
Einsteinium is a synthetic, highly radioactive actinide element named after Albert Einstein and used mainly for scientific research.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
chemical element
ⓘ
superheavy element ⓘ synthetic element ⓘ transactinide element ⓘ |
| atomicNumber | 105 ⓘ |
| blockInPeriodicTable | d-block ⓘ |
| CASNumber | 53850-35-4 ⓘ |
| categoryInPeriodicTable | transition metal ⓘ |
| chemicalSeries | group 5 elements ⓘ |
| countryOfDiscovery | Soviet Union ⓘ |
| discoveredAt | Dubna ⓘ |
| discoveryControversy | subject of naming dispute between US and Soviet teams ⓘ |
| discoveryMethod | heavy-ion nuclear reactions ⓘ |
| discoveryYear | 1960s ⓘ |
| formerProposedName | hahnium ⓘ |
| formerSystematicName |
unnilpentium
ⓘ
linked to:
dubnium
|
| groupInPeriodicTable | 5 ⓘ |
| hasIsotope |
dubnium-255
ⓘ
linked to:
dubnium
dubnium-256 ⓘ
linked to:
dubnium
dubnium-257 ⓘ
linked to:
dubnium
dubnium-258 ⓘ dubnium-260 ⓘ
linked to:
dubnium
dubnium-261 ⓘ
linked to:
dubnium
dubnium-262 ⓘ dubnium-263 ⓘ
linked to:
dubnium
dubnium-266 ⓘ dubnium-268 ⓘ
linked to:
dubnium
|
| hazard | radioactive health hazard ⓘ |
| IUPACName | dubnium ⓘ |
| mostStableIsotope |
dubnium-268
ⓘ
linked to:
dubnium
|
| mostStableIsotopeHalfLife | about 28 hours ⓘ |
| name | dubnium ⓘ |
| namedAfter |
Dubna
ⓘ
Joint Institute for Nuclear Research ⓘ |
| occurrence |
does not occur naturally
ⓘ
produced artificially ⓘ |
| periodInPeriodicTable | 7 ⓘ |
| phaseAtSTP | solid (predicted) ⓘ |
| predictedChemicalBehavior |
similar to niobium
ⓘ
similar to tantalum ⓘ |
| predictedElectronConfiguration | [Rn] 5f14 6d3 7s2 ⓘ |
| radioactivity | highly radioactive ⓘ |
| recognizedBy | IUPAC ⓘ |
| seriesInPeriodicTable | transactinide series ⓘ |
| stability | no stable isotopes ⓘ |
| standardAtomicWeight | [268] ⓘ |
| symbol | Db ⓘ |
| uses | scientific research only ⓘ |
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: dubnium Description of subject: Dubnium is a synthetic, highly radioactive transactinide chemical element with atomic number 105, named after the Russian research town of Dubna where it was first studied.
Referenced by (13)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
FLNR (Flerov Laboratory of Nuclear Reactions)
linked to: dubnium
linked to: dubnium
linked to: dubnium
linked to: dubnium
linked to: dubnium
linked to: dubnium
linked to: dubnium
linked to: dubnium
linked to: dubnium