Configuration of Fe

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Jonghwee Park 1K
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Joined: Fri Apr 06, 2018 11:04 am

Configuration of Fe

Postby Jonghwee Park 1K » Sun May 06, 2018 4:10 am

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!

Garrett Dahn 1I
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Joined: Fri Apr 06, 2018 11:02 am
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Re: Configuration of Fe

Postby Garrett Dahn 1I » Sun May 06, 2018 8:33 am

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.

kendallbottrell
Posts: 31
Joined: Fri Apr 06, 2018 11:02 am

Re: Configuration of Fe

Postby kendallbottrell » Sun May 06, 2018 12:01 pm

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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