# What is an example of an antibonding orbitals practice problem?

Practice reading the MO diagram of $\text{HF}$ below.
5. What is the bond order? Does it make sense given the single bond in $\text{H"-"F}$?
6. Why is there one $\sigma$ orbital by itself at the bottom? What does that suggest about the energies of the $2 s$ of $\text{F}$ and the $1 s$ of $\text{H}$?