{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.mendelevium","code":"thing-q1898","url":"https://ver.cy/models/thing/q1898/","name":"mendelevium","alternateNames":["mendelevium-245","mendelevium-246","mendelevium-247","mendelevium-248","mendelevium-249","mendelevium-250","mendelevium-251","mendelevium-252","mendelevium-253","mendelevium-254","mendelevium-255","mendelevium-256"],"kind":"thing","status":"published","version":"0.2.0-wave.4","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 synthetic radioactive actinide element with atomic number 101, symbol Md, first produced in 1955 at Berkeley by bombarding einsteinium with alpha particles and named after Dmitri Mendeleev, creator of the periodic table, made only a few atoms at a time, with isotopes from about mendelevium-244 to mendelevium-260 of which mendelevium-258 has the longest half-life of about 51 days; it has no uses outside research. The model gives public reference information only.","purpose":"Let an agent explain mendelevium, relay its discovery, properties and isotopes from chemistry references at a public level, describe the isotopes the registry aliases name as a group, and distinguish mendelevium from fermium, nobelium and other heavy actinides, without operational nuclear detail.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Synthetic","Atom-at-a-time chemistry","Named for Mendeleev","Research only"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What mendelevium is.","layers":[{"id":"definition","name":"Definition","description":"Definition.","findings":[{"id":"definition-finding","name":"Definition","description":"Definition.","questions":[{"text":"What is mendelevium, and how does it differ from fermium and nobelium?","kind":"definition"},{"text":"Is the question about public reference facts, or operational detail the model does not give?","kind":"boundary"}]}]},{"id":"isotopes","name":"Isotopes","description":"Isotopes.","findings":[{"id":"isotopes-finding","name":"Isotopes","description":"Isotopes.","questions":[{"text":"What are the main mendelevium isotopes and their half-lives?","kind":"definition"},{"text":"Which entry fits isotopes of mendelevium?","kind":"action"}]}]}]},{"id":"science","name":"Science","description":"Chemistry.","layers":[{"id":"chemistry","name":"Chemistry","description":"Chemistry.","findings":[{"id":"chemistry-finding","name":"Chemistry","description":"Chemistry.","questions":[{"text":"What has atom-at-a-time chemistry revealed about mendelevium?","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 mendelevium produced, at a general level?","kind":"provenance"},{"text":"Which sources are cited?","kind":"provenance"}]}]}]},{"id":"history","name":"History","description":"History.","layers":[{"id":"discovery","name":"Discovery","description":"Discovery.","findings":[{"id":"discovery-finding","name":"Discovery","description":"Discovery.","questions":[{"text":"How did Ghiorso, Seaborg and colleagues discover mendelevium in 1955?","kind":"provenance"},{"text":"Which entry fits Albert Ghiorso?","kind":"action"}]}]},{"id":"naming","name":"Naming","description":"Naming.","findings":[{"id":"naming-finding","name":"Naming","description":"Naming.","questions":[{"text":"Why was it named after Mendeleev during the Cold War?","kind":"provenance"},{"text":"Which entry fits Dmitri Mendeleev?","kind":"action"}]}]}]},{"id":"context","name":"Context","description":"Heavy elements.","layers":[{"id":"heavy","name":"Heavy","description":"Heavy element research.","findings":[{"id":"heavy-finding","name":"Heavy","description":"Heavy.","questions":[{"text":"How does mendelevium fit into heavy element research?","kind":"provenance"},{"text":"Which entry fits transuranium element?","kind":"action"}]}]},{"id":"table","name":"Table","description":"Periodic table.","findings":[{"id":"table-finding","name":"Table","description":"Table.","questions":[{"text":"Where does mendelevium sit in the periodic table?","kind":"provenance"},{"text":"Which entry fits periodic table?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Explain mendelevium's discovery, place in the periodic table and known properties.","Cite chemistry references for isotope data and half-lives."],"mustNot":["Give operational detail on producing or handling heavy radioactive elements.","Present predicted properties as measured ones.","Confuse mendelevium with other actinides."],"requiresHuman":["Any work with radioactive material, which only licensed facilities may decide."]},"ethics":{"considerations":["Mendelevium exists only in tiny amounts in research facilities under strict radiation control.","Honesty about what is measured and what is predicted keeps science trustworthy."],"affectedParties":["Researchers","Students","Workers in nuclear facilities"]},"owners":{"steward":"The licensed research facility that produces it; nobody else holds it.","roles":[],"masterSystems":[]},"relations":[{"target":"Q19577","type":"parent","note":"registry parent class"},{"target":"actinide","type":"related","note":"in registry terms"},{"target":"Dmitri Mendeleev","type":"related"},{"target":"einsteinium","type":"related"},{"target":"fermium","type":"related","note":"and nobelium"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.mendelevium","Wikidata: Q1898 (https://www.wikidata.org/wiki/Q1898)","CAS: 7440-11-1 mendelevium","atomic number: 101"]},"properties":{"applicability":"required","items":["atomic number: 101 count","discovered: 1955 year - Berkeley","longest-lived isotope: mendelevium-258, about 51 days note","first synthesis yield: about 17 atoms note"]},"recognition":{"applicability":"required","items":["Actinide element 101","Mendelevium-244 to mendelevium-260 isotopes","Fermium is element 100; nobelium is element 102","Not observed in bulk; produced a few atoms at a time."]},"capabilities":{"applicability":"required","items":["explain the element","relay discovery and properties","describe isotopes","distinguish related elements"]},"hazards":{"applicability":"required","items":["Radioactivity","Agents giving operational nuclear detail","Registry aliases listing many isotopes"]},"interfaces":{"applicability":"required","items":["Radiation protection regulations","IUPAC element naming"]},"context":{"applicability":"required","items":["Scientific research.","mendelevium isotopes","mendelevium ions in solution chemistry studies"]}},"sources":[{"title":"Wikidata item Q1898: mendelevium","url":"https://www.wikidata.org/wiki/Q1898","note":"identity and sense of the item"},{"title":"Wikipedia: Mendelevium","url":"https://en.wikipedia.org/wiki/Mendelevium","note":"general description of the item"}],"openQuestions":["Should the isotopes be grouped as one sub-entry?","How should chemistry references be linked?","The registry entry lists isotope aliases; should they be grouped?"],"resources":{"spec":"/models/things/publications/thing-q1898/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1898/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-13T19:14:32Z","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 2026-10-06T19:51:56+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}