{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.nitrogen","code":"thing-q627","url":"https://ver.cy/models/thing/q627/","name":"nitrogen","alternateNames":["allotrope of nitrogen","dissolved organic nitrogen","soil nitrogen","nitrogen-14","soil organic nitrogen","nitrogen-22","nitrogen-19","nitrogen-20","nitrogen-18","nitrogen-17","nitrogen-16","nitrogen-25"],"kind":"thing","status":"published","version":"0.2.0-wave.3","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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.","purpose":"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.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Triple-bonded diatomic gas","Atmospheric abundance","Biological essential","Fixed industrially by the Haber process"],"structure":{"bundles":[{"id":"identify","name":"Identify","description":"What nitrogen is.","layers":[{"id":"properties","name":"Properties","description":"Properties.","findings":[{"id":"properties-finding","name":"Properties","description":"Properties.","questions":[{"text":"What are the physical and chemical properties of nitrogen?","kind":"definition"},{"text":"Is the question about the element, a compound or an environmental nitrogen pool?","kind":"boundary"}]}]},{"id":"isotopes","name":"Isotopes","description":"Isotopes.","findings":[{"id":"isotopes-finding","name":"Isotopes","description":"Isotopes.","questions":[{"text":"Which isotopes exist, and how is nitrogen-15 used as a tracer?","kind":"definition"},{"text":"Which entry fits the specific isotope?","kind":"action"}]}]}]},{"id":"cycle","name":"Cycle","description":"The nitrogen cycle.","layers":[{"id":"cycle","name":"Cycle","description":"Cycle.","findings":[{"id":"cycle-finding","name":"Cycle","description":"Cycle.","questions":[{"text":"How does nitrogen move through fixation, nitrification, assimilation and denitrification?","kind":"provenance"},{"text":"Which entry fits nitrogen cycle?","kind":"action"}]}]},{"id":"pools","name":"Pools","description":"Soil and water pools.","findings":[{"id":"pools-finding","name":"Pools","description":"Pools.","questions":[{"text":"What are soil nitrogen, soil organic nitrogen and dissolved organic nitrogen, and why do they matter?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]}]},{"id":"industry","name":"Industry","description":"Uses and safety.","layers":[{"id":"uses","name":"Uses","description":"Uses.","findings":[{"id":"uses-finding","name":"Uses","description":"Uses.","questions":[{"text":"How is nitrogen produced and used, from fertilisers to cryogenics and inert atmospheres?","kind":"provenance"},{"text":"Which entry fits the Haber process?","kind":"action"}]}]},{"id":"safety","name":"Safety","description":"Safety.","findings":[{"id":"safety-finding","name":"Safety","description":"Safety.","questions":[{"text":"What hazards do nitrogen gas and liquid present, and what rules apply?","kind":"provenance"},{"text":"Is the user asking about a confined space or exposure, which needs safety professionals?","kind":"boundary"}]}]}]},{"id":"environment","name":"Environment","description":"Environment and history.","layers":[{"id":"pollution","name":"Pollution","description":"Nitrogen pollution.","findings":[{"id":"pollution-finding","name":"Pollution","description":"Pollution.","questions":[{"text":"How do nitrogen compounds cause eutrophication and air pollution, and how are they regulated, with sources?","kind":"provenance"},{"text":"Which sources are cited?","kind":"provenance"}]}]},{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How was nitrogen discovered, and how did the Haber-Bosch process change agriculture?","kind":"provenance"},{"text":"Which entry fits the history of chemistry?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Describe nitrogen's properties, uses and its cycle in nature.","Monitor oxygen levels where nitrogen is used and raise an alarm when they fall.","Report fertiliser and nitrogen oxide pollution data from authorized sources."],"mustNot":["Send people into a confined space where nitrogen may have displaced oxygen without testing and a permit.","Handle liquid nitrogen without the protective equipment and venting the work requires.","Seal liquid nitrogen in a closed container.","Help use nitrogen gas to harm a person or an animal."],"requiresHuman":["Permitting entry into a confined space that has been inerted with nitrogen.","Releasing nitrogen-rich effluent or fertiliser near water bodies."]},"ethics":{"considerations":["Nitrogen asphyxia gives no warning; workers and rescuers die in confined spaces each year.","Synthetic nitrogen fertiliser feeds much of humanity and also pollutes rivers and coasts."],"affectedParties":["Workers in confined spaces","People handling cryogenic liquids","Communities near polluted waters"]},"owners":{"steward":"Nobody owns the element; suppliers and users answer for the gas and liquid they hold under workplace safety rules.","roles":[],"masterSystems":[]},"relations":[{"target":"Q19753344","type":"parent","note":"registry parent class"},{"target":"diatomic nonmetal","type":"related","note":"in registry terms"},{"target":"pnictogen","type":"related","note":"group 15"},{"target":"nitrogen cycle","type":"related","note":"through the biosphere"},{"target":"Haber process","type":"related","note":"into ammonia"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.nitrogen","Wikidata: Q627 (https://www.wikidata.org/wiki/Q627)","symbol: N","CAS: 7727-37-9"]},"properties":{"applicability":"required","items":["atomic number: 7 Z","standard atomic weight: 14.007 u","boiling point: -195.8 degrees C","share of atmosphere: about 78 percent - by volume"]},"recognition":{"applicability":"required","items":["Element 7, symbol N, diatomic gas","78 percent of air","Nitrates, ammonia and soil nitrogen are compounds or pools, not the element","A colourless, odourless gas; a colourless liquid when cryogenically cooled."]},"capabilities":{"applicability":"required","items":["relay properties and isotopes","explain the nitrogen cycle","relay industrial uses and safety","distinguish element from compounds and pools"]},"hazards":{"applicability":"required","items":["Asphyxiation in confined spaces","Cold burns from liquid nitrogen","Eutrophication and air pollution from nitrogen compounds","Confusing element with compounds"]},"interfaces":{"applicability":"required","items":["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"]},"context":{"applicability":"required","items":["Inert atmosphere, fertiliser production, cryogenics and chemical industry.","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"]}},"sources":[{"title":"Wikidata item Q627: nitrogen","url":"https://www.wikidata.org/wiki/Q627","note":"identity and sense of the item"},{"title":"Wikipedia: Nitrogen","url":"https://en.wikipedia.org/wiki/Nitrogen","note":"general description of the item"}],"openQuestions":["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?"],"resources":{"spec":"/models/things/publications/thing-q627/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q627/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T22:52:19Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:52:01+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}