Oxidation states
The key idea
Oxidation state is a formal electron-counting concept. IUPAC defines it through an ionic approximation of bonds rather than as a literal charge measured on an atom in a molecule.
Why it matters
It is indispensable for redox chemistry, nomenclature and systematic comparison of compounds.
A picture to remember
It is indispensable for redox chemistry, nomenclature and systematic comparison of compounds.