Electron configuration with s and d subshells

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Ally Huang- 1F
Posts: 103
Joined: Thu Jul 25, 2019 12:16 am

Electron configuration with s and d subshells

Postby Ally Huang- 1F » Fri Oct 18, 2019 3:44 pm

Can someone explain why 3d has a lower energy than 4s if you are technically filling the 3d orbitals after the 4s orbitals?

Brittany Tran 3I
Posts: 50
Joined: Sat Jul 20, 2019 12:16 am

Re: Electron configuration with s and d subshells

Postby Brittany Tran 3I » Fri Oct 18, 2019 4:10 pm

After the 4s orbital is filled and at least one electron is in a 3d orbital, then the 3d orbitals have a lower energy than the 4s orbital. It's like this just because it corresponds with experimental observations.

KBELTRAMI_1E
Posts: 108
Joined: Sat Jul 20, 2019 12:17 am

Re: Electron configuration with s and d subshells

Postby KBELTRAMI_1E » Fri Oct 18, 2019 4:17 pm

Isn't there an exception? I'm also confused.

Vicki Liu 2L
Posts: 101
Joined: Sat Aug 24, 2019 12:15 am

Re: Electron configuration with s and d subshells

Postby Vicki Liu 2L » Fri Oct 18, 2019 4:22 pm

Actually, I think it's the other way. According to the Aufbau principle, 4s orbitals are lower in energy than 3d orbitals, which explains why 4s is filled first.
However, as the 3d orbital fills up, the relative energies of the two orbitals fluctuate and change. Eventually, 4s electrons become higher in energy.

Natalie C 1K
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Joined: Wed Sep 18, 2019 12:16 am
Been upvoted: 1 time

Re: Electron configuration with s and d subshells

Postby Natalie C 1K » Sat Oct 19, 2019 12:36 pm

As they are filling up, if the energies of the two orbitals fluctuate and change, then why is it always the case that 4s comes before 3d? if they are fluctuating, then shouldn't 3d sometimes come before 4s?


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