Periodic Table Interactive Lookup Panel mechanism

Model scope

The lookup concept is valid, but the instrument cannot receive PASS until the canonical data release, units, field definitions, missing-value policy, search semantics, and trend-neighbor/comparison algorithm are specified. The four vectors use exact, independently checkable entries including hydrogen Z=1/configuration 1s1, helium Z=2/configuration 1s2, and the standard N/O/F Pauling electronegativities.

• Pure lookup is appropriate for element properties, but the specification does not define the canonical dataset, field schema, revision date, or precedence when IUPAC, NIST, CRC, and other sources differ.
• The trend-arrow algorithm is underspecified: neighbor is not defined as adjacent atomic number, adjacent grid cell, or same-period/same-group neighbor; comparison direction and handling of properties with exceptions are also unspecified.
• Search and filter semantics are unspecified, including case sensitivity, aliases, element names versus symbols, partial matches, and behavior for no or multiple matches.
• The claim of a full property set is not operationally testable because required fields, units, significant figures, and missing-value behavior are not defined.

Units and conventions

• Atomic mass is reported in unified atomic mass units (u), using standard atomic weights where applicable; values for radioactive elements would require an explicit convention for mass number or bracketed isotope mass.
• Electronegativity is the dimensionless Pauling scale.
• First ionization energy is reported in kJ/mol; the specification must not silently mix this with eV or J/atom.
• Atomic radius, covalent radius, van der Waals radius, and ionic radius are distinct quantities and must not share an unlabeled radius field.
• State means the standard state near room temperature and approximately 1 atm unless the panel explicitly states another temperature and pressure.
• Group numbers use the modern IUPAC 1–18 convention and periods use IUPAC period numbering.

Inspectable vector

One of 4 source-bound review vectors:

{
  "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."
}

Failure boundary

BREAK_CLAIMED · SELF_FLAGGED

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.

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
• BOUNDARY_HAZARD_CATALOG.json