Several forms of diatomic oxygen are known, including O2 + , O2 – , and O2 2– . Using an MO energy level diagram, determine the bond order for O2 + , O2 – , and O2 2– and compare the O–O bond lengths of these ionic forms of dioxygen relative to O2 (i.e. shorter or longer). Be sure to explain the changes in bond length as related to the MO diagram. Which of these molecules are paramagnetic?