krypton
Let an agent identify krypton and its properties, relay isotopes, production and uses from reference sources, explain its historical role in defining the metre, and distinguish it from other noble gases.
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.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent identify krypton and its properties, relay isotopes, production and uses from reference sources, explain its historical role in defining the metre, and distinguish it from other noble gases.
A chemical element with symbol Kr and atomic number 36, a colourless, odourless noble gas present in the atmosphere at about one part per million, obtained by fractional distillation of liquid air; krypton is used in lighting, lasers, insulating windows and, through the isotope krypton-85, in leak detection and as a tracer, its spectral line once defined the metre, and it has six stable isotopes.
What it is for: Lighting, lasers, insulation and tracers.
It can be relay properties and isotopes; explain production and uses; explain the metre definition history; distinguish from other noble gases.
Distinguishing features
Noble gas
Six stable isotopes
Kr-85 from nuclear fission
Former metre standard
What it looks like
A colourless gas that glows whitish in a discharge tube.
Physical character
atomic number: 36 Z
standard atomic weight: 83.798 u
boiling point: -153.4 degrees C
atmospheric abundance: about 1.1 ppm - by volume
How it is recognised
Element 36, symbol Kr
Noble gas, trace in air
Argon and xenon are the neighbouring noble gases; the fictional kryptonite is unrelated
Related models
is a kind of - in registry terms
is adjacent to - element 35
is adjacent to - element 37
defined - from 1960 to 1983
In practice
Families and kinds
krypton gas
isotopes from krypton-69 to krypton-101, with six stable and Kr-85 radioactive
krypton compounds such as krypton difluoride, few and unstable
krypton in lamps and lasers
Identifiers
symbol Kr
CAS 7439-90-9
Standards and regulation
Compressed gas safety standards
Radiation rules for krypton-85 sources
Monitoring of Kr-85 as a nuclear activity indicator
Failure modes and hazards
Asphyxiation in confined spaces
Radiation from Kr-85
Confusion with fiction
Also called
+1
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.krypton
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identify What krypton is.
Identity.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of krypton? definition
- Is the question about krypton or a neighbouring noble gas? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- Which isotopes exist, and how is krypton-85 used and monitored? definition
- Which entry fits the specific isotope? action
Source Occurrence and production.
Supply.
Occurrence
Occurrence.
Occurrence
Occurrence.
- Where does krypton occur, and how is it extracted from air? provenance
- Which entry fits air separation? action
Supply
Supply.
Supply
Supply.
- Who produces krypton, and how is it traded, with sources? measurement
- Which sources are cited? provenance
Use Uses and safety.
Application.
Uses
Uses.
Uses
Uses.
- How is krypton used in lighting, lasers, windows and leak detection? provenance
- Which entry fits gas discharge lamp? action
Safety
Safety.
Safety
Safety.
- What hazards does krypton present, and how is Kr-85 regulated? provenance
- Is the user asking about a personal exposure, which needs a specialist? boundary
Context History.
Context.
Discovery
Discovery.
Discovery
Discovery.
- How was krypton discovered by Ramsay and Travers in 1898, and how was it named? provenance
- Which references are standard? provenance
Metre
The metre definition.
Metre
Metre.
- How did a krypton-86 spectral line define the metre from 1960 to 1983? provenance
- Which entry fits the history of the metre? action
What the second pass must settle
- Should krypton-85 be a separate entry?
- How should reference data be linked?
- The registry entry has merged aliases naming isotopes; should they be split off?