Chapter 5, Problem 5.12P

Although ${\text{KrF}}^{+}$ and ${\text{XeF}}^{+}$ have been studied, ${\text{KrBr}}^{+}$ has not yet been prepared. For ${\text{KrBr}}^{+}$ :
a. Propose a molecular orbital diagram, showing the interactions of the valence shell s and porbitals to form molecular orbitals.
b. Toward which atom would the HOMO be polarized? Why?
c. Predict the bond order.
d. Which is more electronegative, Kr or Br? Explain your reasoning.