# Expanded structure formula and Lewis dot structure, whats the difference?

I am teaching my self the basics of chemistry and I have done lewis dot structure before. Right now I am going into carbon chemistry which often use structure formulas to represent compounds. There is this formula called the expanded structure, and from what I can see, the expanded formula is just the same as the Lewis except we use the lines to represent bonds etc?

So my main question is whats the difference between them and do we have to assign the formal charges in the expanded structure formula? Also, do we show the dots (valence electrons) in the expanded formula? Thank you.