Lewis structures, explained one electron at a time
Draw a structure and have every atom checked, solve one step by step, compare resonance contributors, and turn VSEPR shapes in 3D. Every answer comes with its reasoning: where each electron went, and why.
Live example: water
Lines are shared electron pairs, and the cyan dots are oxygen's lone pairs. Those lone pairs repel harder than the bonds, bending water to about 104.5 degrees.
10 tools, one chemistry engine
Every tool draws on the same engine, so a compound's structure, formal charges and shape agree wherever you meet them, from a first octet to XeF₄.
Every answer explained
No black boxes. Electron counts, central-atom choices, formal charges, and octet exceptions come with the reasoning, not just the result.
Scientifically rigorous
Formal charge is computed exactly as valence minus nonbonding minus half the bonding electrons, then validated so charges always sum to the molecular charge and the electrons always balance.
Built for classrooms
Classes, assignments, auto-grading with teacher overrides, and reports of the mistakes your class actually makes, problem by problem.
For students
- Draw structures yourself with real-time octet and valence feedback.
- Step through resonance contributors and see which bonds change, instead of memorizing static diagrams.
- Rotate 3D VSEPR models until geometry finally clicks.
For teachers
- Assign compounds by formula, the engine validates and auto-grades each one.
- See the misconceptions your class actually has, aggregated from real attempts.
- Export a gradebook CSV whenever you need it.
Start with a formula
No installs and no textbook licenses. Type anything from H₂O to XeF₄ into the generator and read how its structure is built, step by step.