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Solution: In the ground-state electron configuration of Fe 3+ , how many unpaired electrons are present?

Problem

In the ground-state electron configuration of Fe 3+ , how many unpaired electrons are present?

Solution

We are being asked how many electrons are unpaired in the ground-state electron configuration of Fe3+ ion. To figure that out, let’s first write the electron configuration of a neutral (uncharged) Fe atom.

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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