O2^2- is diamagnetic and O2- paramagnetic. Why?
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O2 is paramagnetic because it has two unpaired electrons
It shows that all the electrons in oxygen are paired, so oxygen should be diamagnetic.
Yet oxygen is paramagnetic.
The Lewis structure of O2 gives a misleading impression.
If any of the molecular orbital contains unpaired electrons, it is regarded as paramagnetic. Since O2 has (pi*2Px1=pi*2Py1) config. its paramagnetic while O2²- has (pi*2Px=pi*2Py²) config. it is diamagnetic.
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