nitrogen
Let an agent identify nitrogen and its properties, relay its atmospheric, biological and industrial roles, explain the nitrogen cycle and environmental issues with sources, and distinguish the element from its compounds and from soil and dissolved nitrogen pools.
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 nitrogen and its properties, relay its atmospheric, biological and industrial roles, explain the nitrogen cycle and environmental issues with sources, and distinguish the element from its compounds and from soil and dissolved nitrogen pools.
A chemical element with symbol N and atomic number 7, a colourless, odourless diatomic gas making up about 78 percent of the atmosphere, essential to life in proteins and nucleic acids, and cycled through soils, water and organisms in organic and inorganic forms; nitrogen is produced industrially by air separation, converted to ammonia for fertilisers, and its compounds are central to agriculture, explosives and pollution, with two stable isotopes, nitrogen-14 and nitrogen-15.
What it is for: Inert atmosphere, fertiliser production, cryogenics and chemical industry.
It can be relay properties and isotopes; explain the nitrogen cycle; relay industrial uses and safety; distinguish element from compounds and pools.
Distinguishing features
Triple-bonded diatomic gas
Atmospheric abundance
Biological essential
Fixed industrially by the Haber process
What it looks like
A colourless, odourless gas; a colourless liquid when cryogenically cooled.
Physical character
atomic number: 7 Z
standard atomic weight: 14.007 u
boiling point: -195.8 degrees C
share of atmosphere: about 78 percent - by volume
How it is recognised
Element 7, symbol N, diatomic gas
78 percent of air
Nitrates, ammonia and soil nitrogen are compounds or pools, not the element
Related models
is a kind of - in registry terms
is a kind of - group 15
is cycled by - through the biosphere
is fixed by - into ammonia
In practice
Families and kinds
nitrogen gas and liquid nitrogen
isotopes nitrogen-14 and nitrogen-15, with radioactive isotopes from nitrogen-10 to nitrogen-25
nitrogen pools: soil nitrogen, soil organic nitrogen, dissolved organic nitrogen
nitrogen compounds such as ammonia, nitrates and nitrogen oxides
allotropes and polymeric forms under extreme conditions
Identifiers
symbol N
CAS 7727-37-9
Standards and regulation
Cryogenic and compressed gas safety standards
Fertiliser and nitrate regulations such as the EU Nitrates Directive
Air quality rules on nitrogen oxides
Chemical safety data sheets
Failure modes and hazards
Asphyxiation in confined spaces
Cold burns from liquid nitrogen
Eutrophication and air pollution from nitrogen compounds
Confusing element with compounds
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.nitrogen
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 nitrogen is.
Identity.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of nitrogen? definition
- Is the question about the element, a compound or an environmental nitrogen pool? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- Which isotopes exist, and how is nitrogen-15 used as a tracer? definition
- Which entry fits the specific isotope? action
Cycle The nitrogen cycle.
Science.
Cycle
Cycle.
Cycle
Cycle.
- How does nitrogen move through fixation, nitrification, assimilation and denitrification? provenance
- Which entry fits nitrogen cycle? action
Pools
Soil and water pools.
Pools
Pools.
- What are soil nitrogen, soil organic nitrogen and dissolved organic nitrogen, and why do they matter? provenance
- Which references are standard? provenance
Industry Uses and safety.
Application.
Uses
Uses.
Uses
Uses.
- How is nitrogen produced and used, from fertilisers to cryogenics and inert atmospheres? provenance
- Which entry fits the Haber process? action
Safety
Safety.
Safety
Safety.
- What hazards do nitrogen gas and liquid present, and what rules apply? provenance
- Is the user asking about a confined space or exposure, which needs safety professionals? boundary
Environment Environment and history.
Context.
Pollution
Nitrogen pollution.
Pollution
Pollution.
- How do nitrogen compounds cause eutrophication and air pollution, and how are they regulated, with sources? provenance
- Which sources are cited? provenance
History
History.
History
History.
- How was nitrogen discovered, and how did the Haber-Bosch process change agriculture? provenance
- Which entry fits the history of chemistry? action
What the second pass must settle
- Should the nitrogen cycle and nitrogen pollution be separate primary entries?
- How should environmental data be linked?
- The registry entry has merged aliases naming isotopes and environmental pools; should they be split off?