{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T20:49:57Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 3,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T10:00:00Z",
      "ingestedAt": "2026-10-06T07:01:33+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:52:01+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q671",
    "registryId": "vr.tr.francium",
    "name": "francium",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.MAT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q671/",
  "model": {
    "registry_id": "vr.tr.francium",
    "name": "francium",
    "purpose": "Let an agent explain francium as an element, relay its properties, occurrence and research uses from reference sources, and separate fact from popular exaggeration about its reactivity and quantity.",
    "definition": "A highly radioactive alkali metal, chemical element 87, the heaviest member of group 1 and one of the rarest naturally occurring elements, formed in trace amounts by decay of actinium; its longest-lived isotope, francium-223, has a half-life of about 22 minutes, so it has no practical uses beyond research in atomic physics and spectroscopy.",
    "what_it_is_for": "Not for anything practical; a subject of atomic research.",
    "affordances": [
      "explain properties and isotopes",
      "explain occurrence and how it is made",
      "relay research uses",
      "correct common exaggerations"
    ],
    "distinguishing_features": [
      "Heaviest alkali metal",
      "No stable isotopes",
      "Trace natural occurrence in uranium ores",
      "Studied as trapped atoms"
    ],
    "appearance": "Never seen in bulk; expected to be a silvery metal, observed only as trapped atoms.",
    "visual_identification": [
      "Element 87, alkali metal",
      "Extremely radioactive and short-lived",
      "Caesium is the heaviest stable alkali metal"
    ],
    "physical_properties": [
      {
        "quantity": "atomic number",
        "typical_range": "87",
        "unit": "",
        "note": ""
      },
      {
        "quantity": "half-life of francium-223",
        "typical_range": "about 22",
        "unit": "minutes",
        "note": "longest-lived isotope"
      },
      {
        "quantity": "natural abundance",
        "typical_range": "grams at any time in the crust",
        "unit": "estimate",
        "note": "often quoted as about 20-30 g"
      }
    ],
    "families_and_kinds": [
      "francium-223 from actinium decay",
      "synthetic isotopes made in accelerators",
      "francium in atomic physics experiments"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "alkali metal",
        "why": "group 1"
      },
      {
        "relation": "is produced by",
        "target": "actinium",
        "why": "decay of actinium-227"
      },
      {
        "relation": "is related to",
        "target": "caesium",
        "why": "the lighter homologue"
      },
      {
        "relation": "is studied in",
        "target": "atomic physics",
        "why": "trapped atom experiments"
      }
    ],
    "identifiers": [
      {
        "scheme": "chemical symbol",
        "value_or_pattern": "Fr",
        "note": ""
      },
      {
        "scheme": "CAS number",
        "value_or_pattern": "7440-73-5",
        "note": ""
      }
    ],
    "standards_and_regulation": [
      "Radiation protection regulations for research handling"
    ],
    "failure_modes_and_hazards": [
      "Radiation hazard in research",
      "Popular claims about explosive reactivity that cannot be tested in bulk",
      "Confusing estimates of natural quantity"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Report francium's properties and isotopes from authoritative sources.",
        "Explain why bulk properties of francium have never been observed."
      ],
      "must_not": [
        "Present popular claims about francium's reactivity as observed fact.",
        "Help obtain or handle radioactive material outside licensing and radiation protection rules.",
        "Invent measured values for bulk francium.",
        "Present francium as a practical material for ordinary uses."
      ],
      "requires_human": [
        "Approving research with radioactive sources."
      ]
    },
    "ethics": {
      "considerations": [
        "Radioactive materials need strict control to protect researchers and the public."
      ],
      "affected_parties": [
        "Researchers",
        "The public"
      ]
    },
    "owners": {
      "steward": "Nobody holds it in bulk; licensed laboratories answer for the traces they make.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q671: francium",
      "url": "https://www.wikidata.org/wiki/Q671",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Francium",
      "url": "https://en.wikipedia.org/wiki/Francium",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "element",
        "name": "Element",
        "description": "What francium is.",
        "rationale": "Chemistry.",
        "layers": [
          {
            "id": "properties",
            "name": "Properties",
            "description": "Properties and isotopes.",
            "findings": [
              {
                "id": "properties-finding",
                "name": "Properties",
                "description": "Properties.",
                "questions": [
                  {
                    "text": "What are the known and predicted properties of francium, and what isotopes exist?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about the element or about popular claims that need correction?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "occurrence",
            "name": "Occurrence",
            "description": "Occurrence and production.",
            "findings": [
              {
                "id": "occurrence-finding",
                "name": "Occurrence",
                "description": "Occurrence.",
                "questions": [
                  {
                    "text": "How does francium occur naturally, and how is it produced for research?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits actinium?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "research",
        "name": "Research",
        "description": "Scientific use.",
        "rationale": "Research.",
        "layers": [
          {
            "id": "experiments",
            "name": "Experiments",
            "description": "Trapped atom experiments.",
            "findings": [
              {
                "id": "experiments-finding",
                "name": "Experiments",
                "description": "Experiments.",
                "questions": [
                  {
                    "text": "How is francium studied in atom traps, and what questions do experiments address?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "limits",
            "name": "Limits",
            "description": "What cannot be done.",
            "findings": [
              {
                "id": "limits-finding",
                "name": "Limits",
                "description": "Limits.",
                "questions": [
                  {
                    "text": "Why can francium not be studied in bulk, and what follows for claims about it?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits radioactive decay?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "safety",
        "name": "Safety",
        "description": "Radiation.",
        "rationale": "Safety.",
        "layers": [
          {
            "id": "radiation",
            "name": "Radiation",
            "description": "Radiation hazard.",
            "findings": [
              {
                "id": "radiation-finding",
                "name": "Radiation",
                "description": "Radiation.",
                "questions": [
                  {
                    "text": "What radiation protection rules apply to research with francium?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits radiation protection?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "handling",
            "name": "Handling",
            "description": "Handling.",
            "findings": [
              {
                "id": "handling-finding",
                "name": "Handling",
                "description": "Handling.",
                "questions": [
                  {
                    "text": "How are trace amounts handled in laboratories?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the question about a specific facility, which needs its safety officer?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "context",
        "name": "Context",
        "description": "History and teaching.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "history",
            "name": "History",
            "description": "Discovery.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How did Marguerite Perey discover francium in 1939?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the discoverer?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "teach",
            "name": "Teach",
            "description": "Teaching.",
            "findings": [
              {
                "id": "teach-finding",
                "name": "Teach",
                "description": "Teaching.",
                "questions": [
                  {
                    "text": "How is francium presented in teaching, and which misconceptions arise?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the periodic table?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should isotopes be separate entries?",
    "How should research references be linked?",
    "The registry entry has merged isotope aliases; should they be split off?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}