Periodic Table Interactive Lookup Panel implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t7-004

Effect

Computation or source lookup only

Input and validation requirements

The specification does not define validation behavior for out-of-range or overflow-sized selections, does not define a precise trend-arrow branch rule, and leaves the radius convention unspecified. The convention probe can therefore produce materially different correct-looking outputs, while the extreme input can overflow before lookup unless range validation occurs first.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "query": "H",
    "query_mode": "element_symbol",
    "case": "lower"
  },
  "expected_outputs": {
    "match_count": 1,
    "symbol": "H",
    "name": "Hydrogen",
    "atomic_number": 1,
    "standard_atomic_weight_u": 1.008,
    "electron_configuration": "1s1",
    "pauling_electronegativity": 2.2,
    "first_ionization_energy_kJ_per_mol": 1312,
    "standard_state": "gas",
    "group": 1,
    "period": 1
  },
  "reference_data": {
    "target_element": {
      "symbol": "H",
      "name": "Hydrogen",
      "atomic_number": 1,
      "standard_atomic_weight_u": 1.008,
      "electron_configuration": "1s1",
      "pauling_electronegativity": 2.2,
      "first_ionization_energy_kJ_per_mol": 1312,
      "standard_state": "gas",
      "group": 1,
      "period": 1
    },
    "source_convention_by_field": {
      "atomic_number": "IUPAC periodic-table convention",
      "standard_atomic_weight_u": "CIAAW/IUPAC standard atomic weight, conventional rounded textbook value",
      "electron_configuration": "NIST Atomic Spectra Database ground-state configuration",
      "pauling_electronegativity": "Pauling scale, widely tabulated standard value",
      "first_ionization_energy_kJ_per_mol": "NIST, widely tabulated standard value",
      "standard_state": "CRC Handbook, standard state near room temperature and 1 atm",
      "group": "IUPAC modern group-number convention",
      "period": "IUPAC periodic-table convention"
    }
  },
  "working": "1. Normalize the case: lower-case query 'h' corresponds to symbol H. 2. Exact symbol lookup returns one row, so match_count = 1. 3. The returned atomic-number key is 1; no numerical property formula is applied. 4. The displayed values are copied from the referenced H row, including 1.008 u, 2.20, and 1312.0 kJ/mol."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche7/tranche7-results.json