electron configuration

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Sarah Rutzick 1L
Posts: 50
Joined: Tue Oct 10, 2017 7:13 am

electron configuration

Postby Sarah Rutzick 1L » Wed Nov 01, 2017 11:58 pm

When writing electron configuration, should the d orbital electrons of lower energy come before the s and p orbital electrons of higher energy? For example, in the electron configuration for gallium, should the configuration be [Ar]3d^10 4s^2 4p^1 or [Ar]4s^2 3d^10 4p^1 ?

Justin Chang 2K
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Re: electron configuration

Postby Justin Chang 2K » Thu Nov 02, 2017 12:07 am

I believe the 3d will come first since the d shell is now filled, so it overall is in a lower energy state than the 4s orbital. can someone else confirm this?

Morgan Baxter 1E
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am

Re: electron configuration

Postby Morgan Baxter 1E » Thu Nov 02, 2017 9:49 am

Yes this is correct. The 3d will be written before the 4s and 4p because principal quantum number n=3 is lower energy than principal quantum number n=4, and it is standard to write it in order of increasing energy.

Maddie Hong 1I
Posts: 21
Joined: Fri Sep 29, 2017 7:04 am

Re: electron configuration

Postby Maddie Hong 1I » Thu Nov 02, 2017 4:00 pm

The electron configuration is written in order of increasing n, even though that may not be the order that the shells are filled.
So the [Ar]3d^10 4s^2 4p^1 is the correct one

Daniel Rivas 3L
Posts: 32
Joined: Fri Sep 29, 2017 7:07 am

Re: electron configuration

Postby Daniel Rivas 3L » Thu Nov 02, 2017 4:09 pm

I asked my TA about this. She says that either way is correct, but that Dr. Lavelle has a specific reason for listing off the 3d10 before the 4s2 and 4p6 orbitals. So yeah just do it the way Dr. Lavelle has been doing it.

Ashley Fallon 3C
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Joined: Fri Sep 29, 2017 7:06 am
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Re: electron configuration

Postby Ashley Fallon 3C » Sun Nov 05, 2017 2:08 am

I read in the textbook that generally for elements with an atomic number of 20 or above, they begin listing the electron configuration in simple numerical order instead of having configurations where 4s comes before 3d

aaron tang 2K
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

Re: electron configuration

Postby aaron tang 2K » Sun Nov 05, 2017 5:37 pm

The electron configuration is written [Ar]3d104s2 because the it goes in order increasing energy and it is the way that Dr. Lavelle wants it to be written.


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