Electron Configuration

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Rita Chen 1B
Posts: 112
Joined: Sat Jul 20, 2019 12:15 am

Electron Configuration

Postby Rita Chen 1B » Sat Oct 19, 2019 9:35 pm

Can someone please clarify what Dr. Lavelle said about putting 3d in front of 4s? Thank you!

Sebastian Lee 1L
Posts: 157
Joined: Fri Aug 09, 2019 12:15 am
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Re: Electron Configuration

Postby Sebastian Lee 1L » Sat Oct 19, 2019 9:51 pm

Basically, when writing electron configurations you must write in order of lowest energy to highest energy. In K and Ca, the 4s subshell is of a slightly lower energy than the 3d subshell so electrons occupy that space first. However, when Z>20 (you enter the d-block), the 3d subshell actually shifts down to a lower energy level than the 4s subshell. So we need to write 3d before 4s even though 4s if already full for the most part.

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