oganesson
Enable an AI agent to recognise oganesson, assess evidence for its identity and transient state, and judge which observations or proposed operations are supported.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex
Purpose and description
Enable an AI agent to recognise oganesson, assess evidence for its identity and transient state, and judge which observations or proposed operations are supported.
It can be Resolve a name or isotope notation to the oganesson registry entry while retaining its original wording.; Assess whether a candidate decay chain supports an oganesson assignment.; Estimate survival probability over a proposed observation interval using an explicitly selected isotope lifetime model.; Compare nuclear or electronic predictions with the observations that constrain them.; Assess whether a proposed measurement can resolve the expected signature within the available time.; Flag unsupported claims of bulk samples, routine storage, measured phase, or established chemical behaviour..
Distinguishing features
Require atomic number 118 for elemental identity; the approved symbol is Og. [IUPAC naming decision](https://iupac.org/iupac-announces-the-names-of-the-elements-113-115-117-and-118/)
Treat mass number as an isotope discriminator rather than an element identifier: a mass-number match alone cannot establish oganesson.
Require production and correlated detection evidence to distinguish a candidate oganesson event from another reaction product or accidental background.
Distinguish an oganesson parent from its decay descendants; observing a descendant does not establish that the parent still exists.
Reject periodic-table family membership alone as evidence of a measured gas phase or chemical inertness.
Scope
+ Element identity and resolution of historical names
+ Isotope assignments and their evidential status
+ Association of candidate atoms with production and detection events
+ Radioactive decay, elapsed time, and evidence of continued existence
+ Atomic, chemical, and bulk-property claims with explicit evidence status
+ Feasibility of proposed observations and manipulations
- Accelerator and separator design, maintenance, and operation
- Production, procurement, and management of target and projectile materials
- Full models of daughter elements and decay products
- Facility radiation protection and radioactive-waste management
- Independent models of compounds containing oganesson
- General nuclear-structure and electronic-structure theory
Characteristics
- Element identity
- Atomic number 118; symbol Og Anchors every isotope and event assignment to the registered element.
- Isotope assignment
- Mass number A; neutron number A − 118; nuclear state specified or unresolved Separates isotope-specific lifetimes and signatures from element-wide claims.
- Assignment status
- Candidate; supported by analysis; independently corroborated; disputed; withdrawn Prevents an interpretation of a sparse event record from becoming an unquestioned identity.
- Production-event association
- Links to experiment, reaction channel, run, and candidate recoil Makes the claimed origin of an oganesson atom traceable.
- Decay-event signature
- Event energy in MeV; relative time in s; detector position with instrument-specific units; uncertainties Supports evaluation of correlated events and competing assignments.
- Isotope half-life estimate
- s, with uncertainty interval, event count, and evaluation reference Constrains observation windows without treating a statistical lifetime as a deterministic deadline.
- Parent existence status
- Inferred at production; survival uncertain; decay observed; observation ended without resolved outcome Distinguishes historical detection from current material availability.
- Electronic or chemical condition
- Charge state; electronic state; binding environment; measured, inferred, predicted, or unknown Prevents neutral-atom calculations from being applied silently to ions or hypothetical compounds.
- Property evidence class
- Direct measurement; experimental inference; evaluated estimate; theoretical prediction; unsupported Controls whether a property may support an operational decision.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 10 layers · 10 findings · 25 questions.
Element and isotope identity Establishes what a record means when it identifies something as oganesson.
Element names, isotope labels, and experimental assignments express different levels of identity.
Element designation
Resolves the registered element independently of any particular isotope.
Canonical oganesson reference
Record the canonical identity and preserve historical or provisional designations as contextual aliases.
- Does the record designate atomic number 118, and how is it linked to vr.tr.oganesson? definition
- Which naming authority or original publication explains the designation used? provenance
Nuclide resolution
Separates elemental identity from mass number and possible nuclear-state assignments.
Isotope-specific identity
Record the assigned isotope and unresolved alternatives without narrowing the element model to one isotope.
- Which mass number and nuclear state are assigned, and which remain unresolved? definition
- What evidence distinguishes this assignment from neighbouring isotopes or another element with the same mass number? boundary
Production and event attribution Connects an oganesson claim to the experiment and event sequence supporting it.
A reaction intended to produce oganesson does not by itself establish that an observed product is oganesson.
Production context
Captures the reaction interpretation needed to assess candidate origin.
Reaction-to-candidate link
Associate the candidate with target and projectile isotopes, the proposed reaction channel, and the original experimental record.
- Which target, projectile, and proposed reaction channel support production of the assigned oganesson isotope? provenance
- Which competing reaction products or channel assignments could account for the candidate? boundary
Correlated detection
Assesses whether detector events belong to one physically plausible parent-decay sequence.
Candidate chain support
Record the spatial, temporal, and energy evidence used to associate the recoil and subsequent events.
- What measured positions, energies, and time intervals connect the candidate recoil with its proposed decay chain? measurement
- How were accidental correlations, missing events, and detector limitations evaluated? provenance
- What independent events or analyses corroborate or challenge the assignment? provenance
Decay and parent survival Represents isotope-specific decay evidence and the changing existence status of a candidate parent.
A detected oganesson event is a historical observation, not an enduring inventory item.
Decay characterisation
Separates individual decay observations from population-level nuclear-property estimates.
Lifetime and decay assignment
Record decay-mode interpretations and lifetime estimates with their sparse-data limitations.
- Which decay modes and daughter assignments are observed, inferred, or predicted for this isotope? measurement
- What half-life estimate, uncertainty interval, event count, and statistical treatment support the adopted lifetime? measurement
Time-dependent availability
Tracks what may be concluded about parent survival at a specified time.
Parent versus descendant state
Distinguish an inferred surviving parent, an observed decay, and a period without sufficient observation.
- At what reference time was the parent inferred to exist, and what observations constrain its subsequent state? measurement
- Does the available signal concern oganesson itself or a descendant requiring a neighbouring element model? boundary
- What survival probability and uncertainty apply over the proposed observation interval? action
Electronic, chemistry, and phase claims Organises property claims while preserving their experimental or theoretical basis.
Family-based analogies and calculations must not silently become measured properties of oganesson.
Atomic and chemical predictions
Makes electronic-state assumptions and computational dependencies explicit.
Property claim applicability
Record what a proposed electronic or chemical property describes and what evidence supports it.
- Does the claim concern an isolated neutral atom, an ion, or oganesson in a specified binding environment? definition
- Is the property measured, experimentally inferred, or calculated, and which source establishes that status? provenance
- How do the treatment of relativistic effects, electron correlation, and computational uncertainty affect the prediction? boundary
Bulk-property boundaries
Prevents single-atom evidence from being treated as a measurement of macroscopic material.
Phase and material claim status
Qualify phase, density, and transition-temperature claims by material scale, conditions, and evidence.
- What temperature, pressure, material quantity, and lifetime assumptions underlie the claimed bulk property? definition
- What evidence supports extrapolating from atomic calculations or detection events to a bulk phase? boundary
Observation and operation feasibility Determines what a proposed action could establish or accomplish for a transient oganesson candidate.
An operation must fit both the lifetime of the assigned isotope and the information available from very limited events.
Measurement window
Relates a proposed observable to timing, detection probability, and expected evidence.
Resolvable oganesson observable
Assess whether the proposed measurement could distinguish the intended oganesson property or event.
- Which oganesson-specific observable would the measurement resolve, and what alternative interpretation would it exclude? action
- How do transfer time, acquisition time, detector efficiency, and isotope lifetime constrain success? measurement
- What could a null result establish after accounting for production and detection uncertainty? boundary
Material action boundaries
Evaluates claims that an oganesson entity can be retained, transferred, or chemically manipulated.
Supported manipulation
Require evidence of relevant existence, timing, and physical conditions before treating a proposed manipulation as feasible.
- What evidence supports the availability and survival of oganesson throughout the proposed manipulation? action
- Is the action demonstrated for oganesson, extrapolated from another element, or supported only by a theoretical proposal? provenance
- Which aspects require linked apparatus, target-material, or facility models to determine whether the action may proceed? boundary
What the second pass must settle
- Which oganesson isotopes and nuclear states have accepted experimental assignments in the latest evaluated nuclear data, and which remain candidates?
- What lifetime estimates, decay branches, and uncertainty intervals are best supported by the available event records?
- Which electronic or chemical properties, if any, have direct experimental constraints specific to oganesson?
- How consistent are predictions of oganesson bonding and bulk phase across computational methods and assumptions?
- Which proposed observations or manipulations are feasible given demonstrated production rates, isotope survival, and detection efficiency?