Mesomerism

{
  "id": "MLC-T-CHM-007217",
  "term": "Mesomerism",
  "field": "Chemistry",
  "definition": "The phenomenon where the electronic structure of a molecule cannot be adequately represented by a single Lewis formula but requires a combination of two or more contributing structures. These contributing structures, known as resonance forms, differ only in the placement of electrons, not atoms. The actual molecule is a resonance hybrid, possessing properties intermediate to the contributing structures.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "Lewis formula",
    "aromatic",
    "delocalization",
    "resonance"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1139 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/mesomerism/"
}