Question

What are the rules for drawing Lewis diagrams for molecules?

Answer 1

Just to retire this question....`"the rule is to get it right...."`

Explanation:

Given a chemical formula, by reference to the Periodic Table, we can quickly decide how many valence electrons are present from which to make chemical bonds....and then we use VESPER to determine the geometry. For organic compounds, this is relatively easy....because carbon has four covalent bonds to a first approx...nitrogen three...and oxygen two...

For some pointers see here... but you really should be reading your text, and going over old exam papers, in order to establish the level you need to understand....