Observe the following:
$O_2, C_6H_6, Cu^{2+}, Cu^+, MnO, Fe_3O_4, MgFe_2O_4, NaCl, O_2^+$.
The number of diamagnetic and paramagnetic species is respectively
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$O_2$ and $O_2^+$ are classic MOT paramagnetic examples.
$d^{10}$ ($Zn^{2+}, Cu^+, Ag^+, Cd^{2+}$) species are always Diamagnetic.