Refer to Diagram 9-1.According to molecular orbital theory,which of the following species will have only one unpaired electron? A) C₂ B) Ne₂2+ C) O₂2- D) N2 E) O₂+

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The species O₂+ (O2+) will have only one unpaired electron according to molecular orbital theory. This is because when you remove an electron from the molecular oxygen (O2), which normally has two unpaired electrons in its π*2p molecular orbitals, it results in a species (O2+) with only one unpaired electron.