Diamagnetic have paired electrons while paramagnetic have at least one unpaired electron.

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Explanation:

F2, C2 and N2 are diamagnetic while O2 and B2 are paramagnetic. Diamagnetic are those atoms which have paired electrons while paramagnetic are those atoms which contain at least one unpaired electron so we can say that F2, C2 and N2 have paired electrons while O2 and B2 have unpaired electrons. When diamagnetic materials are allowed to contact with external magnetic field so they will be repelled while paramagnetic materials are attracted by magnetic field due to the presence of unpaired electrons.

Iron oxide (FeO) is the strongest paramagnetic material having the value of 720.



O2 is the correct answer.

Explanation:

O2 species will have the strongest mass shift on a magnetic susceptibility balance because if the species is stronger paramagnetic, it will have a higher mass shift.

O2 species is paramagnetic, and oxygen atoms with two unpaired electrons are paramagnetic, unpaired electrons rotate in the same direction, which raises the magnetic field force that reason it will have the strongest mass shift on a magnetic susceptibility balance.

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The more paramagnetic the species is, the largest the mass shift is -O2. The more paramagnetic the species is, the larger the mass shift. So, since oxygen has two unpaired electrons in the molecular orbital diagram it will have the strongest mass shift on a magnetic susceptibility balance.
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