- ö::0:so,2-O MAMB:ö:O O O PROVISIONAL LEWIS STRUCTURES T01/S01For each provisional structure, identify if it is the correct Lewis structure (C) or if it needs to be modified according to procedure MA or MB to obtain the correct Lewis structure.MA. Form multiple bonds to the central atom using lone pair on the terminal atom(s) until the central atom has an octet (or septet).MB. Form multiple bonds to the central atom using lone pair on the terminal atom(s) until the central atom has a formal charge of zero (0) or until two double bonds are formed.A provisional structure has the valence electrons distributed in order as (1) a bond between each pair of atoms, (2) an octet for each ligand (terminal) atom or ligand group (CH3, NH2 or OH) and (3)any remaining electrons on the central atom.

Lewis structure of a molecules shows the bonding of atoms in a molecule along with the lone pair and shared pair of electrons that are present in the molecule. The structure in which most atoms are neutral and not having any formal charge are most preferable structures.Lewis structure of SO32- 1. MA- Form multiple bonds to the central atom using lone pair on the terminal atoms until the central atom has an octet. Formal charge on S: 6-0-12(8)=+2 2. MB-Form multiple bonds on the central atom using lone pair on the terminal atoms until the central atom has a formal charge of zero or until two double bonds are formed. Formal charge on S:6-0-12(12)=0 But the correct Lewis structure of SO32- is by MA.