1. The problem statement, all variables and given/known data We need to draw the Lewis structure for certain compounds, such as C2H3Cl. 2. Relevant equations None. I know how to draw Lewis structures, but I have a question: How do we know how to distribute the available valence electrons? For example, in drawing C2H3Cl, the right way to do it would be to have 2 H bonded with a C, this C would have a double bond with the other C, who would be bonded with the remaining H as well as the Cl, who would have 3 lone pairs of electrons. But how do we know this is the right arrangement? Why no draw it with all H bonded with one C, both C linked through a single bond, and C and Cl linked through a double or triple bond (double: C would have a lone pair of electrons, triple: C would no have a lone pair of electrons). 3. The attempt at a solution See 2. Does it have something to do with the fact that it looks more symmetrical when you have both C in the middle with a double bond, and 2 atoms on each side with a single bond? Thank you for your help, I hope I was clear enough.