Orbital diagram of the Fe³⁺ ion

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Orbital diagram of Fe3+ with an argon core: an empty 4s box and five 3d boxes each with one up arrow — The orbital diagram of the iron(III) ion, Fe³⁺: [Ar] 3d⁵. Iron loses its two 4s electrons first and then one 3d electron, so 4s is drawn empty and each of the five 3d orbitals holds one electron.

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Fe³⁺: [Ar] 3d⁵

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