{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.yttrium","code":"thing-q941","url":"https://ver.cy/models/thing/q941/","name":"yttrium","alternateNames":["yttrium-91","yttrium-92","yttrium-76","yttrium-77","yttrium-78","yttrium-79","yttrium-80","yttrium-81","yttrium-82","yttrium-83","yttrium-84","yttrium-85"],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The chemical element with atomic number thirty-nine, a silvery transition metal chemically similar to the lanthanides and classified among the rare earth elements, with one stable isotope, yttrium-89, and radioactive isotopes such as yttrium-90 used in cancer therapy, obtained from rare earth ores and used in phosphors for displays and lighting, in yttrium aluminium garnet lasers, superconductors, ceramics and alloys; yttrium is named after the Swedish village of Ytterby.","purpose":"Let an agent explain yttrium as an element and its properties and isotopes, describe uses in lasers, phosphors, superconductors and medicine, present supply information, and support learning.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Rare earth chemistry","Phosphor and laser uses","Superconductor component","Medical isotope"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What yttrium is.","layers":[{"id":"element","name":"Element","description":"The element.","findings":[{"id":"element-finding","name":"Element","description":"Element.","questions":[{"text":"What are the properties and chemistry of yttrium, and why is it grouped with the rare earths?","kind":"definition"},{"text":"Which entry fits rare earth elements?","kind":"action"}]}]},{"id":"isotopes","name":"Isotopes","description":"Isotopes.","findings":[{"id":"isotopes-finding","name":"Isotopes","description":"Isotopes.","questions":[{"text":"What isotopes of yttrium exist, and why is yttrium-90 important?","kind":"definition"},{"text":"Which entry fits radioisotopes?","kind":"action"}]}]}]},{"id":"use","name":"Use","description":"Uses.","layers":[{"id":"technology","name":"Technology","description":"Lasers, phosphors and superconductors.","findings":[{"id":"technology-finding","name":"Technology","description":"Technology.","questions":[{"text":"How is yttrium used in garnet lasers, display phosphors, superconductors and ceramics?","kind":"provenance"},{"text":"Which entry fits a specific application?","kind":"action"}]}]},{"id":"medical","name":"Medical","description":"Medical uses.","findings":[{"id":"medical-finding","name":"Medical","description":"Medical.","questions":[{"text":"How is yttrium-90 used in radionuclide therapy, in general terms?","kind":"provenance"},{"text":"Is the user asking about their own treatment, which needs a clinician?","kind":"boundary"}]}]}]},{"id":"supply","name":"Supply","description":"Sources and supply.","layers":[{"id":"sources","name":"Sources","description":"Sources.","findings":[{"id":"sources-finding","name":"Sources","description":"Sources.","questions":[{"text":"Where is yttrium obtained, and how is supply organised?","kind":"provenance"},{"text":"Which entry fits rare earth mining?","kind":"action"}]}]},{"id":"names","name":"Names","description":"Ytterby elements.","findings":[{"id":"names-finding","name":"Names","description":"Names.","questions":[{"text":"Why are yttrium, ytterbium, terbium and erbium named after Ytterby?","kind":"provenance"},{"text":"Which entry fits element naming?","kind":"action"}]}]}]},{"id":"learn","name":"Learn","description":"History and teaching.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How was yttrium discovered and isolated?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can yttrium illustrate rare earth chemistry and materials?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe yttrium, its properties and uses from reliable sources.","Handle and label yttrium compounds it is authorized to store according to safety data sheets.","Distinguish stable yttrium-89 from radioactive yttrium-90 when discussing risks."],"mustNot":["Help divert radioactive yttrium isotopes from licensed medical or research use.","Advise patients on yttrium-90 therapy for their own case.","Release yttrium dusts or compounds where workers may inhale them.","Hide the origin of rare earth materials from unsafe or illegal mining."],"requiresHuman":["Handling or disposing of radioactive yttrium sources.","Treatment decisions for a patient."]},"ethics":{"considerations":["Rare earth mining often harms local communities and environments.","Radioactive medical isotopes need strict control to protect patients and workers."],"affectedParties":["Mining communities","Patients and medical staff","Workers"]},"owners":{"steward":"The holder of each material; radiation regulators license radioactive isotopes.","roles":[],"masterSystems":[]},"relations":[{"target":"Q428766","type":"parent","note":"registry parent class"},{"target":"light metal","type":"related","note":"category"},{"target":"chemical element","type":"related","note":"category"},{"target":"lutetium","type":"related","note":"another rare earth element entry"},{"target":"rhodium","type":"related","note":"another metal entry"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.yttrium","Wikidata: Q941 (https://www.wikidata.org/wiki/Q941)"]},"properties":{"applicability":"required","items":["Mass density: Approximately 4.47 g/cm3 - This approximate value applies to solid elemental yttrium near room temperature.","Melting point: Approximately 1526 degrees Celsius - This approximate value applies to pure elemental yttrium at atmospheric pressure.","Molar mass: Approximately 88.91 g/mol - This approximate value applies to naturally occurring yttrium."]},"recognition":{"applicability":"required","items":["Atomic number thirty-nine","Rare earth behaviour","Scandium is its lighter congener; the lanthanides are chemically similar","A silvery metal."]},"capabilities":{"applicability":"required","items":["explain the element","describe uses","present supply information","support learning"]},"hazards":{"applicability":"required","items":["Agents giving personal advice on radionuclide therapy","Supply concentration","Confusing yttrium with ytterbium"]},"interfaces":{"applicability":"required","items":["Rare earth trade and processing regulation","Radiation protection for medical isotopes","Chemical safety rules"]},"context":{"applicability":"required","items":["Element thirty-nine, a rare earth transition metal.","yttrium metal and alloys","yttrium isotopes including yttrium-90","yttrium oxide and phosphors","yttrium aluminium garnet","yttrium in superconductors and ceramics"]}},"sources":[{"title":"Wikidata item Q941: yttrium","url":"https://www.wikidata.org/wiki/Q941","note":"identity and sense of the item"},{"title":"Wikipedia: Yttrium","url":"https://en.wikipedia.org/wiki/Yttrium","note":"general description of the item"}],"openQuestions":["Should yttrium-90 be a separate entry?","How should rare earth supply data be linked?","How should medical guidelines be linked?"],"resources":{"spec":"/models/things/publications/thing-q941/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q941/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T04:21:31Z","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 2026-10-07T10:10:33+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}