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In this type of bonding the 2s orbital and the three 2p orbitals of the carbon atom are mixed to produce four identical orbitals, a process known as sp3 hybridization. The CS2 molecule is linear and the carbon atom is bonded to each sulphur by a double bond.
Carbon dioxide, or #CO_2#, has three resonance structures, out of which one is a major contributor. The #CO_2# molecule has a total of 16 valence electrons - 4 from carbon and 6 from each oxygen atom. Here are the three resonance structures for #CO_2#, all accounting for the 16 valence electrons. The atoms in all three resonance structures have full octets; however, structure 1 will be more stable, and thus contribute more, because it has no separation of charge.