Periodic Element Reference (Electronegativity / Configuration / Oxidation)
Per-element lookup: period, group, block, electronegativity, configuration, oxidation states.
Example
You enter
- Element (atomic number, symbol, or name) Fe
You get
- Atomic number 26
- Electronegativity (Pauling) 1.83
Checked against published worked examples from: IUPAC / NIST / Pauling (1960) / Greenwood + Earnshaw (1997).
Details, formula, and sources
ScopePer-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.
Formula or tableLookup table over atomic number, symbol, or name. Returns period / group / block / Pauling electronegativity / electron configuration / common oxidation states.
Source and editionIUPAC 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'.
Free accessNIST Atomic Spectra Database free at physics.nist.gov/asd. IUPAC nomenclature free at iupac.org.
What governsEstimate 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.
API field namesquery, 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