Orbital diagram of iron (Fe)

An example figure from the Orbital Diagram generator.

Orbital diagram of iron with boxes from 1s to 3d: 3d has one pair and four single up arrows — The full orbital diagram of an iron atom, 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶, with the sublevels in filling order. Every sublevel is full except 3d, where one orbital holds a pair and the other four hold one electron each, giving iron four unpaired electrons.

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Answer key

Fe: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶

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