{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.chlorine","code":"thing-q688","url":"https://ver.cy/models/thing/q688/","name":"chlorine","alternateNames":["chlorine-39","chlorine-40","chlorine-41","chlorine-42","chlorine-43","chlorine-28","chlorine-29","chlorine-30","chlorine-31","chlorine-32","chlorine-33","chlorine-34"],"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 Cl and atomic number 17, a yellow-green diatomic gas and the second lightest halogen, highly reactive and toxic, with stable isotopes chlorine-35 and chlorine-37 and radioactive isotopes from chlorine-28 to chlorine-52 including the long-lived chlorine-36 used in dating, occurring mainly as chloride in seawater and salt deposits and produced by electrolysis of brine; chlorine is used for water disinfection, bleaching, PVC and many chemicals, is essential to life as chloride, and was used as a chemical weapon in the First World War.","purpose":"Let an agent describe chlorine and its properties, relay uses, production and biological roles from chemistry references, relay safety and regulation in general terms, and note its history as a weapon without operational detail.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Reactive halogen","Diatomic gas","Disinfectant use","Toxicity"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What chlorine 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 chlorine, and why is it so reactive?","kind":"definition"},{"text":"Is the question about the element, chloride, bleach or a chlorinated compound?","kind":"boundary"}]}]},{"id":"isotopes","name":"Isotopes","description":"Isotopes.","findings":[{"id":"isotopes-finding","name":"Isotopes","description":"Isotopes.","questions":[{"text":"What isotopes of chlorine exist, and how is chlorine-36 used in dating?","kind":"definition"},{"text":"Which entry fits the specific isotope?","kind":"action"}]}]}]},{"id":"use","name":"Use","description":"Uses and production.","layers":[{"id":"uses","name":"Uses","description":"Uses.","findings":[{"id":"uses-finding","name":"Uses","description":"Uses.","questions":[{"text":"How is chlorine used in water treatment, bleaching, PVC and chemical manufacture?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"production","name":"Production","description":"Production.","findings":[{"id":"production-finding","name":"Production","description":"Production.","questions":[{"text":"How is chlorine produced by the chloralkali process, in general terms?","kind":"provenance"},{"text":"Which entry fits chloralkali process?","kind":"action"}]}]}]},{"id":"safety","name":"Safety","description":"Safety and biology.","layers":[{"id":"safety","name":"Safety","description":"Safety.","findings":[{"id":"safety-finding","name":"Safety","description":"Safety.","questions":[{"text":"What hazards does chlorine pose, and what safety rules and household precautions apply?","kind":"provenance"},{"text":"Is the user describing an exposure, which needs emergency services or poison control now?","kind":"boundary"}]}]},{"id":"biology","name":"Biology","description":"Biology.","findings":[{"id":"biology-finding","name":"Biology","description":"Biology.","questions":[{"text":"What role does chloride play in the body and in the environment?","kind":"provenance"},{"text":"Which sources are cited?","kind":"provenance"}]}]}]},{"id":"context","name":"Context","description":"History.","layers":[{"id":"discovery","name":"Discovery","description":"Discovery.","findings":[{"id":"discovery-finding","name":"Discovery","description":"Discovery.","questions":[{"text":"How was chlorine discovered by Scheele and identified as an element by Davy?","kind":"provenance"},{"text":"Which entry fits the history of chemistry?","kind":"action"}]}]},{"id":"weapon","name":"Weapon","description":"Chemical weapon history.","findings":[{"id":"weapon-finding","name":"Weapon","description":"Weapon.","questions":[{"text":"How was chlorine used as a weapon in the First World War, and how is it regulated today, as historians and treaties describe?","kind":"provenance"},{"text":"Is the question seeking harmful operational detail the model does not provide?","kind":"boundary"}]}]}]}]},"agentConduct":{"may":["Describe chlorine's properties, isotopes and main uses from reliable sources.","Warn that household bleach must never be mixed with acids or ammonia, citing safety authorities.","Monitor chlorine levels in water treatment or pools for an operator who authorises it, and raise alarms."],"mustNot":["Give any information that helps someone release chlorine gas to harm people.","Describe producing chlorine gas outside regulated industrial and laboratory settings.","Advise dosing drinking water or pools beyond the operator's procedures.","Downplay a chlorine leak or exposure."],"requiresHuman":["Responding to a gas leak or deciding on evacuation.","Changing disinfection settings in a water system."]},"ethics":{"considerations":["Chlorine has been used as a chemical weapon and is banned for that use.","It also keeps drinking water safe for billions, so both its benefits and dangers are real."],"affectedParties":["Workers handling it","People near plants and pools","Water users"]},"owners":{"steward":"The operator holding it, licensed by chemical safety regulators.","roles":[],"masterSystems":[]},"relations":[{"target":"Q19605","type":"parent","note":"registry parent class"},{"target":"Q19753344","type":"parent","note":"registry parent class"},{"target":"halogens","type":"related","note":"in registry terms"},{"target":"diatomic nonmetal","type":"related","note":"in registry terms"},{"target":"chloride","type":"related","note":"its common ion"},{"target":"chloralkali process","type":"related","note":"from brine"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.chlorine","Wikidata: Q688 (https://www.wikidata.org/wiki/Q688)","symbol: Cl","CAS: 7782-50-5"]},"properties":{"applicability":"required","items":["atomic number: 17 count","boiling point: -34 C","chlorine-36 half-life: about 301000 years","world production: about 80 million tonnes - per year"]},"recognition":{"applicability":"required","items":["Halogen element 17","Chlorine gas, chloride ion, isotopes Cl-35, Cl-37, Cl-36 and short-lived Cl-28 to Cl-43","Chloride is the ion; hypochlorite is bleach; chlorinated compounds are derivatives","A yellow-green gas with a sharp smell; chlorides are usually white solids."]},"capabilities":{"applicability":"required","items":["describe properties and isotopes","relay uses and production","relay safety and regulation","note history"]},"hazards":{"applicability":"required","items":["Toxic gas release","Mixing bleach with acids or ammonia in homes","Agents providing operational detail on harmful uses","Disinfection by-products"]},"interfaces":{"applicability":"required","items":["Chemical safety and transport rules for chlorine gas","Drinking water disinfection standards","Chemical Weapons Convention","Industrial emission and REACH regulations"]},"context":{"applicability":"required","items":["Disinfection, bleaching and chemical manufacture.","chlorine gas","chloride salts","hypochlorites and chlorine dioxide as disinfectants","organochlorine compounds including PVC","isotopes: stable Cl-35 and Cl-37, cosmogenic Cl-36, and short-lived isotopes such as Cl-28, Cl-39 to Cl-43"]}},"sources":[{"title":"Wikidata item Q688: chlorine","url":"https://www.wikidata.org/wiki/Q688","note":"identity and sense of the item"},{"title":"Wikipedia: Chlorine","url":"https://en.wikipedia.org/wiki/Chlorine","note":"general description of the item"}],"openQuestions":["Should chloride and chloralkali process be separate primary entries?","How should chemistry references be linked?","The registry entry has merged aliases naming many isotopes; should they be split off?"],"resources":{"spec":"/models/things/publications/thing-q688/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q688/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-13T03:52:48Z","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}}