![]() They may or may not be enclosed in a circle for clarity. Formal charges are drawn in close proximity to the atom bearing the charge. In contrast, this convention is not followed in inorganic chemistry. In organic chemistry convention, formal charges are an essential feature of a correctly rendered Lewis–Kekulé structure, and a structure omitting nonzero formal charges is considered incorrect, or at least, incomplete. The formal charge system is just a method to keep track of all of the valence electrons that each atom brings with it when the molecule is formed. It is important to keep in mind that formal charges are just that – formal, in the sense that this system is a formalism. Draw a circle around the atom for which the formal charge is requested (as with carbon dioxide, below). ![]()
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