Electron Configuration: 4s vs 3d

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Schpoozi
Posts: 1
Joined: Sun Jan 12, 2020 3:59 pm

Electron Configuration: 4s vs 3d

Post by Schpoozi » Sun Jan 12, 2020 4:48 pm

I am confused as to why sometimes 4S is lower in energy than 3d and something higher. Would appreciate any resources or explanations on how this works. TIA!
NS_Tutor_Mathias
Posts: 480
Joined: Sat Mar 30, 2019 8:39 pm

Re: Electron Configuration: 4s vs 3d

Post by NS_Tutor_Mathias » Mon Jan 13, 2020 1:09 pm

For the MCAT, all you really need to know is that 4s fills up first, but also loses electrons first. That is all.


Beyond that, there is a whole physics and physical chemistry rabbit hole to go down - and I strongly recommend you don't go there. Unless you have a lot of spare time and interest. In which case, enjoy!
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