phosphorus
Let an agent describe phosphorus and its allotropes, relay properties, uses and biological roles from chemistry references, describe the phosphorus cycle and resource issues, and relay safety in general terms without operational detail on hazardous uses.
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 describe phosphorus and its allotropes, relay properties, uses and biological roles from chemistry references, describe the phosphorus cycle and resource issues, and relay safety in general terms without operational detail on hazardous uses.
A chemical element with symbol P and atomic number 15, a reactive nonmetal existing in allotropes including highly reactive and toxic white phosphorus, safer red phosphorus, black phosphorus and violet phosphorus, essential to life in DNA, ATP and bones, mined as phosphate rock for fertilisers that underpin world food production, and used in matches, detergents, steel making and semiconductors; phosphorus has isotopes from phosphorus-24 to phosphorus-47, with phosphorus-32 used as a radiotracer, and its runoff causes eutrophication.
What it is for: Fertilisers, biology and industry.
It can be describe properties and allotropes; relay uses and biological roles; describe the phosphorus cycle; relay safety.
Distinguishing features
Multiple allotropes
Essential nutrient
Fertiliser basis
Reactivity of white form
What it looks like
White waxy solid, red powder or black flaky solid, depending on allotrope.
Physical character
atomic number: 15 count
stable isotope: phosphorus-31 isotope - only one
white phosphorus melting point: 44.1 C
phosphate rock production: about 220 million tonnes - per year
How it is recognised
Element 15, a reactive nonmetal
White, red, black and violet allotropes; isotopes P-24 to P-47
Phosphate is the oxidised ion; phosphine is the hydride; phosphor is an unrelated luminescent material
Related models
is a kind of - in registry terms
forms - its main natural form
is essential to - and ATP
cycles through - in ecosystems
In practice
Families and kinds
white phosphorus
red phosphorus
black phosphorus and phosphorene
violet phosphorus
isotopes such as phosphorus-24 to phosphorus-28 and radiotracer phosphorus-32
phosphorus compounds: phosphates, phosphides, phosphine, organophosphorus compounds
Identifiers
symbol P
CAS 7723-14-0
Standards and regulation
Chemical safety and transport rules for white phosphorus
Fertiliser and detergent phosphate regulations
EU critical raw material listing of phosphate rock
International humanitarian law on incendiary weapons
Failure modes and hazards
Fire and burns from white phosphorus
Toxicity and phossy jaw historically
Eutrophication from runoff
Agents providing operational detail on hazardous uses
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.phosphorus
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What phosphorus is.
Science.
Properties
Properties and allotropes.
Properties
Properties.
- What are the properties of phosphorus, and how do its allotropes differ? definition
- Is the question about the element, an allotrope, a compound or a phosphor? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- What isotopes exist, and how is phosphorus-32 used as a tracer? definition
- Which entry fits the specific isotope? action
Life Biology and agriculture.
Science.
Biology
Biological roles.
Biology
Biology.
- How does phosphorus function in DNA, ATP, membranes and bones? provenance
- Which references are standard? provenance
Agriculture
Fertilisers.
Agriculture
Agriculture.
- How is phosphate rock turned into fertiliser, and why is supply a concern? provenance
- Which entry fits phosphate fertiliser? action
Use Industry and environment.
Application.
Industry
Industrial uses.
Industry
Industry.
- How is phosphorus used in matches, detergents, flame retardants, steel and semiconductors? provenance
- Which sources are cited? provenance
Environment
Environment.
Environment
Environment.
- How does phosphorus runoff cause eutrophication, and how is it managed? provenance
- Which entry fits eutrophication? action
Context History and safety.
Context.
History
History.
History
History.
- How was phosphorus discovered by Brand in 1669, and how did its uses develop? provenance
- Which entry fits the history of chemistry? action
Safety
Safety.
Safety
Safety.
- What hazards do white phosphorus and phosphine pose, and what rules apply, in general terms? provenance
- Which entry fits chemical safety? action
What the second pass must settle
- Should phosphate and white phosphorus be separate primary entries?
- How should chemistry references be linked?
- The registry entry has merged aliases naming many isotopes; should they be split off?