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