Periodic Element Reference (Electronegativity / Configuration / Oxidation)

Per-element lookup of period / group / block / Pauling electronegativity / electron configuration / common oxidation states. Covers H through Kr plus Ag / I / Au / Hg / Pb. By atomic number, symbol, or name.

Lookup table over atomic number, symbol, or name. Returns period / group / block / Pauling electronegativity / electron configuration / common oxidation states.

IUPAC atomic numbers and element names (current IUPAC). Pauling electronegativity per Pauling, 'The Nature of the Chemical Bond' (3rd ed., 1960). Electron configurations per NIST Atomic Spectra Database. Common oxidation states per Greenwood + Earnshaw, 'Chemistry of the Elements' (2nd ed., 1997); Cotton + Wilkinson, 'Advanced Inorganic Chemistry'.

NIST Atomic Spectra Database free at physics.nist.gov/asd. IUPAC nomenclature free at iupac.org.

Estimate only. Readability formulas and similar metrics are derived from a representative population and have known edge-case noise. The classroom teacher governs final text selection, grade placement, and assessment decisions.

Field names used by the API: query, atomic_number, electronegativity_pauling

• Coverage H-Kr plus 5 selected heavy elements; full table out of scope for this Y.12 extensionscope
• Electronegativity scale Pauling scale; Allred-Rochow and Mulliken scales are alternativesconvention