d-orbital in the electron configuration

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DesireBrown1J
Posts: 80
Joined: Wed Sep 18, 2019 12:18 am

d-orbital in the electron configuration

Postby DesireBrown1J » Tue Oct 22, 2019 7:36 pm

When writing the electron configuration, why is it 3d instead of 4d? I was assuming that it would be 4d because it is in the 4th period.

Example: Ge=[Ar]3d104s24p3 instead of Ge=[Ar]4d104s24p3

Heba Mengesha 3D
Posts: 50
Joined: Sat Sep 07, 2019 12:19 am

Re: d-orbital in the electron configuration

Postby Heba Mengesha 3D » Tue Oct 22, 2019 7:54 pm

s-orbital electrons are closer to the nucleus (more stable) and farther from the nucleus (less stable) compared to the corresponding d-orbitals. This makes them favorable to occupy when no d-electrons are present, but less favorable to occupy when d-electrons are present, which is why they are filled first.

Minh Ngo 4G
Posts: 109
Joined: Thu Jul 25, 2019 12:17 am

Re: d-orbital in the electron configuration

Postby Minh Ngo 4G » Tue Oct 22, 2019 9:09 pm

Because the 3d is not full yet. You have to fill the lower energy level first (Aufbau Principle)

905289082
Posts: 81
Joined: Fri Aug 09, 2019 12:16 am

Re: d-orbital in the electron configuration

Postby 905289082 » Thu Oct 24, 2019 9:24 am

As seen through the Aufbau Principle, it's imperative to fill the 3d energy level before you can fill the 4d.


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