Solution: Is the following ion diamagnetic or paramagnetic? Fe3+

Problem

Is the following ion diamagnetic or paramagnetic? 

Fe3+

Solution

We are being asked if the species is paramagnetic or diamagnetic so we have to determine the electron configuration of Fe3+ ion

Recall that paramagnetic species have 1 or more unpaired electrons while diamagnetic contains 0 unpaired electrons.

Write the electron configuration of a neutral (uncharged) Fe atom.

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Ground-state means that Iron is in its lowest energy form (not in an excited state). 

Neutral element:       Atomic number = # protons = # of electrons


Neutral Iron (Fe):

Atomic number = 26
# of electrons = 26 e-

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