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nobelium

vr.tr.nobelium · thing-q1901

Let an agent explain nobelium at public reference level, relay discovery history, naming dispute, isotopes and chemistry from IUPAC and nuclear science sources with attribution, describe the named isotopes, and distinguish nobelium from other actinides, transactinides and the Nobel Prize.

Thing Registry Physical world and living systems PHY.MAT
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Understand What nobelium is.

Definition

Definition.

Definition

Definition.

  1. What is nobelium, and how does it differ from mendelevium, lawrencium, transactinides and the Nobel Prize? definition
  2. Is the question about chemistry, history or the naming dispute? boundary

Isotopes

Isotopes.

Isotopes

Isotopes.

  1. What are nobelium-250 to 255 and the longest-lived isotopes? definition
  2. Which entry fits the specific isotope? action
History Discovery.

Claims

Discovery claims.

Claims

Claims.

  1. What did the Stockholm, Berkeley and Dubna teams claim, and how did the 1992 report assess them? provenance
  2. Which references are standard? provenance

Naming

Naming.

Naming

Naming.

  1. Why was the name nobelium retained despite the credit to Dubna? provenance
  2. Which sources are cited? provenance
Science Chemistry and physics.

Chemistry

Chemistry.

Chemistry

Chemistry.

  1. Why is nobelium unusually stable in the +2 state? provenance
  2. Which entry fits actinide chemistry? action

Production

Production.

Production

Production.

  1. How is nobelium produced in accelerators, at reference level? provenance
  2. Which entry fits Joint Institute for Nuclear Research? action
Context Wider context.

Transfermium wars

Transfermium Wars.

Transfermium wars

Transfermium wars.

  1. What were the Transfermium Wars over element names? provenance
  2. Which entry fits Transfermium Wars? action

Stability

Nuclear structure.

Stability

Stability.

  1. What do nobelium isotopes reveal about nuclear shell structure? provenance
  2. Which entry fits island of stability? action

Classifiers Filled

Family
Thing Registry
Category
Physical world and living systems
Entry kind
thing
Plane
PHY
Domain
PHY.MAT
Other names and narrower kinds
nobelium-250, nobelium-251, nobelium-252, nobelium-253, nobelium-254, nobelium-255, nobelium-256, nobelium-257, nobelium-258, nobelium-259, nobelium-260, nobelium-261

What it is Filled

A synthetic radioactive actinide element with symbol No and atomic number 102, whose discovery claims from Stockholm in 1957, Berkeley in 1958 and Dubna in the 1960s were long disputed, with the IUPAC-IUPAP Transfermium Working Group in 1992 crediting the Dubna work, while the name nobelium, after Alfred Nobel, was retained; its known isotopes, including nobelium-250 to nobelium-255 and heavier ones, are short-lived, with nobelium-259 among the longest-lived at about an hour, so it is studied only atom by atom. The model stays at public reference level.

Why it exists Filled

Let an agent explain nobelium at public reference level, relay discovery history, naming dispute, isotopes and chemistry from IUPAC and nuclear science sources with attribution, describe the named isotopes, and distinguish nobelium from other actinides, transactinides and the Nobel Prize.

Distinguishing features Filled

  • Synthetic
  • Disputed discovery
  • Short-lived
  • Divalent chemistry

What robots and AI may and may not do Filled

Must not

  • Offer or claim to supply nobelium as a material.
  • Advise on handling radioactive actinides outside a licensed facility.
  • Present one laboratory's discovery claim as uncontested.
  • Give measured values for properties that have only been predicted.

Only with a human decision

  • Any work with radioactive material, which needs a licensed facility and qualified staff.

May

  • Report the properties, isotopes and discovery history of nobelium from published data.
  • Explain that it exists only in tiny, short-lived quantities made in accelerators.

Moral aspects Filled

  • Discovery disputes over heavy elements were shaped by Cold War rivalry, which accounts should state.
  • Radioactive material endangers anyone handling it without proper controls.

Who is affected

  • Laboratory and radiation workers
  • Students and readers
  • Scientific community

Owners Filled

Steward

Nobody owns it; the international chemistry union decides naming and the accelerator laboratories hold the data.

Links to other meta-models Filled

parent

  • Q19577 - registry parent class

related

  • actinide - in registry terms
  • Alfred Nobel
  • IUPAC - with IUPAP in 1992 to Dubna
  • lawrencium

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.nobelium
  • Wikidata: Q1901 (https://www.wikidata.org/wiki/Q1901)
  • symbol: No
  • CAS: 10028-14-5

Direct properties required Filled

  • atomic number: 102 number
  • longest-lived isotope: nobelium-259, about 58 minutes note
  • Transfermium Working Group report: 1992 year
  • stable oxidation state in water: +2 note - unusual for actinides

Recognition required Filled

  • Element 102, actinide
  • Nobelium-250, 251, 252, 253, 254 and 255 among other isotopes
  • Mendelevium is 101; lawrencium is 103; transactinides start at 104; the Nobel Prize is a separate namesake
  • Never seen in bulk; produced a few atoms at a time.

Capabilities and actions required Filled

  • explain properties at reference level
  • relay discovery disputes with attribution
  • describe isotopes
  • distinguish related elements

Hazards and failure modes required Filled

  • Presenting disputed discovery claims as settled
  • Overstating practical uses
  • Requests beyond public reference level, which are out of scope

Standards and interfaces required Filled

  • IUPAC element naming procedures
  • Radiation protection in accelerator laboratories

Context of use required Filled

  • Scientific research only.
  • light nobelium isotopes such as 250 to 255
  • heavier isotopes such as 259
  • nobelium ions in chemistry experiments

Sources Filled

  1. Wikidata item Q1901: nobelium - identity and sense of the item
  2. Wikipedia: Nobelium - general description of the item

Open questions

  • Should isotopes be separate entries?
  • How should IUPAC sources be linked?
  • How should the discovery dispute be presented?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q1901/spec.json