20. Choose all correct statements about O₂ and O₂⁻ based on molecular orbital theory.
(A) Both molecules have a higher ionization energy than a gaseous oxygen atom.
(B) Both molecules are paramagnetic.
(C) O₂ has a shorter bond length than O₂⁻.
(D) O₂⁻ has more electrons and a higher bond order than O₂.
(E) O₂⁻ has a smaller bond dissociation energy.

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