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For iron (Fe), is the electron configuration 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^6, 4s^2. We touched on it during discussion, but I forgot what and more importantly how we should write these configurations once the d-orbital gets involved. Thanks!
That is the correct electron configuration, yes. That 3d comes before 4s because the n energy level of 3d (n = 3) is lower than the n energy level of 4s (n = 4), and according to the Aufbau principle, electrons will occupy lower energy levels before they occupy higher ones.
Remember that it is very likely you will be able to use the "shorthand" - [Ar] 3d^6 4s^2. If it helps, a TA suggested writing it out the way you see it and then rearranging the the d orbital before the s orbital.
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