Carbon dioxide valence shell electron pair

A structure should now be considered which lets all the electron pairs in the valence shell of the central atom(s) get as far away from each other as possible. In the usual tr-w treatment this usually means ignoring the it bonds temporarily since they wilt follow the abonds. In carbon dioxide there will be two crbonds... 

To complete their valence shells, atoms may sometimes share more than one electron pair. Carbon dioxide, CO2, is an example. The carbon atom has four valence electrons, and each oxygen has six valence electrons. A structure that allows each atom to complete its valence shell with eight electrons is... 

In structure A, the dots represent the electrons from carbon, and the x s are the electrons from the oxygens. Structure B shows the bonds and oxygens unshared electrons, and structure C shows only the covalent bonds. Two electron pairs are shared between carbon and oxygen. Consequently, the bond is called a double bond. Each oxygen atom also has two pairs of nonbonding electrons, or unshared electron pairs. The loops in the following structures show that each atom in carbon dioxide has a complete valence shell of eight electrons ... 

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