Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will be diamagnetic? A) O₂ B) C₂+ C) F₂- D) H₂ E) Li₂+

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According to molecular orbital theory, if all the electrons in a species are paired, then the species is diamagnetic. In Option D, the H2 molecule has only two electrons, which are paired in the σ1s molecular orbital, making it diamagnetic. Options A, B, C, and E all have unpaired electrons, making them paramagnetic.