1. The problem statement, all variables and given/known data Ignoring any orbitals not in the valence shell how many orbitals are in each of the following molecules? How many are bonding, nonbonding, and antibonding? How many orbitals are occupied? Co2 2. Relevant equations 3. The attempt at a solution The answer it gives in the book is 4 of each. I tried it and I got confused. The solution it gives is this. "Carbon dioxide has one carbon and two oxygens. Each of these three atoms contribute one 2s orbital and three 2p orbitals. Thus, there are a total of twelve atomic orbitals in the valence shells of these atoms and twelve molecular orbitals in the molecule. Each atom obeys the octet rule. There are a total of four each of bonding, nonbonding and antibonding molecular orbitals so eight orbitals are filled." Can someone explain it a little bit clearer than that?