How do I search for a Lewis structure?

Enter a formula or an English molecule name, such as CO2, carbon dioxide, H2O, water, NO3-, or nitrate ion.

What should I check in a Lewis structure?

Check the total valence electrons, central atom, octets, lone pairs, formal charges, resonance forms, and VSEPR geometry.

Are resonance structures included?

Yes, the nitrate and carbonate pages note the equivalent resonance forms. SO2 also includes a note about common classroom conventions.

Chemistry Tool

Lewis Structure Maker

Open common Lewis structure diagrams with valence electrons, formal charges, VSEPR geometry, and polarity.

Formula Search

Find a Lewis structure

Search by formula or English name. Examples: CO2, carbon dioxide, water, nitrate ion.

CO₂ H₂O CH₄ NH₃ SO₂ NO₃^-CO₃^2-HCN

Common Molecules

CO₂ Carbon dioxide H₂O Water CH₄ Methane NH₃ Ammonia SO₂ Sulfur dioxide NO₃^- Nitrate ion CO₃^2- Carbonate ion HCN Hydrogen cyanide

About Lewis Structure Generator

This site is a curated Lewis structure library for common chemistry formulas. Each page includes a diagram, valence electron count, formal charges, VSEPR geometry, polarity, and common mistakes.

Search accepts formulas and English names, including CO2 (carbon dioxide), H2O (water), NH3 (ammonia), CH4 (methane), SO2 (sulfur dioxide), nitrate ion, carbonate ion, and HCN (hydrogen cyanide).