Electron-budget tool
Valence Electron Calculator
Enter a simple main-group formula or ion. The calculator adds each element contribution and adjusts the total for charge.
The parser covers straightforward main-group formulas without parentheses. Transition-metal electron counting requires a different model.
How the calculation works
- Find the valence electrons for each element.
Use periodic-table group patterns for main-group elements.
- Multiply by the atom count.
For CO2, carbon contributes 4 and two oxygens contribute 12.
- Adjust for charge.
Add electrons for anions and subtract for cations.