Many compounds of the transition-metal elements contain direct bonds between metal atoms...

Many compounds of the transition-metal elements contain direct bonds between metal atoms. We will assume that the z-axis is defined as the metal–metal bond axis. (a) Which of the 3d orbitals (Figure 6.23) can be used to make a σ bond between metal atoms? (b) Sketch the bonding and antibonding MOs. (c)With reference to the “Closer Look” box on the phases of orbitals, explain why a node is generated in the MO. (d) Sketch the energy-level diagram for the Sc₂ molecule, assuming that only the 3d orbital from part (a) is important. (e)What is the bond order in Sc₂?

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