![]() ![]() ![]() For a molecule, we add the number of valence electrons on each atom in the molecule:.Determine the total number of valence (outer shell) electrons in the molecule or ion.Let us determine the Lewis structures of SiH 4, CHO 2 −, CHO 2 −, NO +, and OF 2 as examples in following this procedure: Rearrange the electrons of the outer atoms to make multiple bonds with the central atom in order to obtain octets wherever possible.Place all remaining electrons on the central atom.Distribute the remaining electrons as lone pairs on the terminal atoms (except hydrogen), completing an octet around each atom.(Generally, the least electronegative element should be placed in the center.) Connect each atom to the central atom with a single bond (one electron pair). ![]()
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