Electron Configuration

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JTijerina_4A
Posts: 46
Joined: Mon Sep 23, 2019 12:17 am

Electron Configuration

Postby JTijerina_4A » Mon Dec 02, 2019 2:26 pm

When we write electron configurations, do we write 3d, 4s or 4s, 3d?

xenamclean_1G
Posts: 51
Joined: Sat Jul 20, 2019 12:15 am

Re: Electron Configuration

Postby xenamclean_1G » Mon Dec 02, 2019 2:29 pm

3d, 4s

anjali41
Posts: 109
Joined: Fri Aug 09, 2019 12:15 am

Re: Electron Configuration

Postby anjali41 » Mon Dec 02, 2019 2:32 pm

I think we are supposed to write them as 3D, 4S because it is then easier to see where the electron is being removed from in ions.

AKhanna_3H
Posts: 104
Joined: Wed Sep 18, 2019 12:19 am

Re: Electron Configuration

Postby AKhanna_3H » Mon Dec 02, 2019 4:06 pm

Dr. Lavelle explained that the configurations should be written in order of energy level, so 3d would come before 4s.

Yiyang Jen Wang 4G
Posts: 76
Joined: Wed Nov 21, 2018 12:18 am

Re: Electron Configuration

Postby Yiyang Jen Wang 4G » Sun Dec 08, 2019 12:17 am

You should put 3d before 4s since when 3d is filled it has lower energy than 4s.

Katie Phan 2H
Posts: 17
Joined: Wed Sep 30, 2020 9:55 pm

Re: Electron Configuration

Postby Katie Phan 2H » Thu Oct 15, 2020 6:59 pm

3d, 4s

YZaarour_1E
Posts: 15
Joined: Wed Sep 30, 2020 9:51 pm

Re: Electron Configuration

Postby YZaarour_1E » Thu Oct 15, 2020 7:05 pm

One thing my AP Chem teacher taught us is that "last added doesn't necessarily mean last taken out." So in this example, the 3d is the "last added" since it is added in farther across the periodic table, but it's not necessarily the "last taken out"; if an electron were to be removed, the 4s electrons would be removed before the 3d electrons.

joshtully
Posts: 11
Joined: Wed Sep 30, 2020 9:36 pm

Re: Electron Configuration

Postby joshtully » Sun Oct 18, 2020 9:49 pm

I believe 3d comes before 4s.

Savannah Torella 1L
Posts: 11
Joined: Wed Sep 30, 2020 9:40 pm

Re: Electron Configuration

Postby Savannah Torella 1L » Sun Oct 18, 2020 10:01 pm

When it comes to electron configuration, you want to write the orbitals in the order that they were fully filled. In the context of your question, 3d would be written before the 4s since the 3d orbital is filled up first between the two.


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