{
  "term": "Actinides",
  "role": "concept",
  "parent_concepts": [
    "ElementalSubstance"
  ],
  "layer": 3,
  "domain": "MindsAndAgents",
  "definition": "Radioactive metallic elements with atomic numbers 89-103, including uranium and transuranics",
  "definition_source": "SUMO",
  "wordnet": {
    "synsets": [],
    "canonical_synset": "",
    "lemmas": [],
    "pos": "noun"
  },
  "relationships": {
    "related": [
      "Lanthanides",
      "TransitionMetals",
      "AlkaliMetals",
      "NobleGases",
      "Halogens"
    ],
    "antonyms": [],
    "has_part": [
      "Actinium",
      "Thorium",
      "Protactinium",
      "Uranium",
      "Neptunium",
      "Plutonium",
      "Americium",
      "Curium",
      "Berkelium",
      "Californium",
      "Einsteinium",
      "Fermium",
      "Mendelevium",
      "Nobelium",
      "Lawrencium"
    ],
    "part_of": []
  },
  "safety_tags": {
    "risk_level": "low",
    "impacts": [],
    "treaty_relevant": false,
    "harness_relevant": false
  },
  "training_hints": {
    "positive_examples": [
      "The uranium fuel rods were carefully handled due to their radioactive properties",
      "Plutonium-239 is used in nuclear weapons and reactor fuel",
      "Thorium reactors offer a safer alternative to conventional nuclear power",
      "Americium-241 is commonly found in household smoke detectors",
      "The neptunium isotope was produced artificially in the particle accelerator",
      "Curium samples require special containment due to their intense radioactivity"
    ],
    "negative_examples": [
      "The radon gas accumulated in the basement over time",
      "Cesium-137 contamination spread after the nuclear accident",
      "The technetium isotope is widely used in medical imaging",
      "Polonium poisoning was suspected in the assassination case",
      "Radium paint made the watch dials glow in the dark",
      "The tritium exit signs provided emergency lighting"
    ],
    "disambiguation": "Not to be confused with: Lanthanides, TransitionMetals, AlkaliMetals, NobleGases, Halogens"
  },
  "children": [
    "Actinium",
    "Thorium",
    "Protactinium",
    "Uranium",
    "Neptunium",
    "Plutonium",
    "Americium",
    "Curium",
    "Berkelium",
    "Californium",
    "Einsteinium",
    "Fermium",
    "Mendelevium",
    "Nobelium",
    "Lawrencium"
  ],
  "is_category_lens": true,
  "child_count": 0,
  "meld_source": {
    "meld_id": "org.hatcat/elementalsubstance-melds@0.1.0",
    "applied_at": "2025-12-11T21:04:03.460461Z",
    "pack_version": "7.6.17"
  }
}