The permanganate ion (Mn+7) is diamagnetic since it has a tetrahedral structure with no unpaired electrons.
In 1s,2s and 3s orbitals , the orbital angular momentum of the electrons is the same since they have an equal of azimuthal quantum number .
where for all s orbitals l=0
FeO has 6 unpaired electrons.
Spin magnetic moment=
The last statement is not true because percentage of uncertainty in velocity of an electron in motion is not equal to the percentage uncertainty in its wavelength.