7. Consider the molecular orbital energy level diagrams for O2 and NO. Which of the following is true? I. Both molecules are paramagnetic. II. The bond strength of O2 is greater than the bond strength of NO. III. NO is an example of a homonuclear diatomic molecule. IV. The ionization energy of NO is smaller than the ionization energy of NO+.
(A) I only；
(B) I and II；
(C) I and IV；
(D) II and III；
(E) I, II, and IV
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