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{
  "type": "object",
  "title": "Element",
  "required": [
    "name",
    "symbol",
    "atomicNumber",
    "categoryId",
    "period",
    "block"
  ],
  "properties": {
    "name": {
      "type": "string",
      "description": "Element name (e.g. Hydrogen, Helium)"
    },
    "block": {
      "type": "string",
      "description": "Electron block (s, p, d, or f)"
    },
    "group": {
      "type": [
        "integer",
        "null"
      ],
      "description": "Group (column) in the periodic table (1-18, null for lanthanides/actinides)"
    },
    "phase": {
      "type": [
        "string",
        "null"
      ],
      "description": "Standard state at STP (Solid, Liquid, or Gas)"
    },
    "period": {
      "type": "integer",
      "description": "Period (row) in the periodic table (1-7)"
    },
    "symbol": {
      "type": "string",
      "description": "Chemical symbol (e.g. H, He, Li)"
    },
    "density": {
      "type": [
        "number",
        "null"
      ],
      "description": "Density in g/cm3 (g/L for gases)"
    },
    "atomicMass": {
      "type": [
        "number",
        "null"
      ],
      "description": "Standard atomic weight in unified atomic mass units (u)"
    },
    "categoryId": {
      "type": "string",
      "x-ref-type": "Category",
      "description": "Element category identifier"
    },
    "discoverer": {
      "type": [
        "string",
        "null"
      ],
      "description": "Person or people credited with discovery"
    },
    "atomicNumber": {
      "type": "integer",
      "description": "Atomic number (number of protons)"
    },
    "boilingPointC": {
      "type": [
        "number",
        "null"
      ],
      "description": "Boiling point in degrees Celsius"
    },
    "discoveryYear": {
      "type": [
        "string",
        "null"
      ],
      "description": "Year of discovery (or 'Ancient' for elements known since antiquity)"
    },
    "meltingPointC": {
      "type": [
        "number",
        "null"
      ],
      "description": "Melting point in degrees Celsius"
    },
    "electronegativity": {
      "type": [
        "number",
        "null"
      ],
      "description": "Pauling electronegativity"
    },
    "electronConfiguration": {
      "type": [
        "string",
        "null"
      ],
      "description": "Electron configuration (e.g. [He]2s1)"
    }
  },
  "description": "A chemical element with atomic properties, classification, electron configuration, and discovery information."
}