Lewis structures, worked out

Type any molecule or ion and get the diagram, the electron count, the formal charges, the shape, the bond angle and the hybridization, drawn step by step. Nothing is looked up - every structure is worked out from the formula.

CO₂ · linear

H₂O · bent

SO₂ · bent

NH₃ · trigonal pyramidal

All 60 molecules

Polyatomic ions

Same procedure, one extra term. An ion's charge is part of its electron budget - a 2− ion has two electrons its atoms never brought - and getting that term wrong is the usual reason an ion structure comes out short. Every ion here is drawn in brackets with the charge outside, and the page shows where that charge actually sits.

Reference charts

Elements and the periodic table

Every element has its own page: the electron configuration built by filling orbitals in energy order, the electrons in each shell, the valence count and the charge that follows from it.

What gets calculated

Lewis structures are not a matter of opinion - they fall out of arithmetic. Count the valence electrons the atoms bring, work out which atom is central, spend the electrons on bonds and lone pairs, and check the formal charges. This site runs that procedure for every molecule listed above, enumerates every bond arrangement the electron count allows, and scores them the way a chemistry course scores them.

That means the diagram, the bond angle and the polarity verdict on each page come from the same calculation a marker would run by hand, and an element's configuration comes from its atomic number rather than a lookup table. More on how it works.