https://doi.org/10.1351/goldbook.08160
Symbols for depicting the flow of electrons in a chemical reaction or to generate additional resonance forms.
Notes:
- The tail of the curly arrow shows where an electron pair originates, and the head of the curly arrow shows where the electron pair goes.
- Single-headed curly arrows are used to depict the flow of unpaired electrons.
Examples:
See: electron pushing