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According to molecular orbital theory, the O2^2+ molecular ion should be?
a) unstable
b) diamagnetic
c) paramagnetic
d) magnetic
e) ionic
Some help with this one please
The magnetic properties of molecules reflect the numbers of unpaired spins. If all the electrons in a substance are paired, the substance is diamagnetic. A diamagnetic substance is weakly repelled by an external magnetic field because the field induces some populating of higher energy electronic states in which the electrons are unpaired and this energy is released when the substance leaves the magnetic field. Substances in which electron spins are unpaired in the ground state are relatively strongly attracted to a magnetic field and are said to be paramagnetic. The greater the number of unpaired spins, the greater the paramagnetism. The attraction to the magnetic field is due to the freedom of the unpaired electrons in the ground state to align with it. Generally this alignment disappears when the field is removed. However in some paramagnetic materials, the spins are close enough together that the interactions between them are strong enough to keep them aligned even without an applied magnetic field. These substances are called ferromagnetic.
The striking thing about the MO description of the electronic configuration of O2 is that it predicts that O2 is paramagnetic, as there are two unpaired electrons in the π*2p molecular orbitals. The paramagnetism of O2 had been observed prior to the development of MO theory, and it was difficult to explain, because the Lewis structure :O=O: has no unpaired electrons. One of the reasons why MO theory was widely accepted in a relatively short period of time is because it can so simply explain the observed paramagnetism of O2.