Use suitable molecular-orbital software to calculate the wavefunctions and energy levels for closo-[B₆H₆]²⁻. From that output, draw a molecular orbital energy diagram for the orbitals primarily involved in B–B bonding and sketch the form of the orbitals. How do these orbitals compare qualitatively with the qualitative description for this anion in this chapter? Is B–H bonding neatly separated from the B–B bonding in the computed wavefunctions?