Exceptions for electron configuration

Moderators: Chem_Mod, Chem_Admin

Adrienne B 1J
Posts: 32
Joined: Sat Feb 24, 2018 3:00 am

Exceptions for electron configuration

Postby Adrienne B 1J » Sat May 05, 2018 6:48 pm

Hi,

I was wondering if someone would be willing to list the different exceptions to electron configuration that were mentioned in class? thank you!

Luis Avalos 1D
Posts: 30
Joined: Wed Nov 22, 2017 3:00 am

Re: Exceptions for electron configuration

Postby Luis Avalos 1D » Sat May 05, 2018 7:02 pm

In period 4, Chromium and Copper fill their shells differently than you'd expect. Instead of Chromium having the electron configuration [Ar] 3d4 4s2, it's actually more stable with the following configuration [Ar] 3d5 4s1. Likewise, Copper is expected to be [Ar] 3d9 4s2 but it fills the d shell and becomes [Ar] 3d10 4s1. This pattern also occurs in period 5.

Madison Hacker 1L
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: Exceptions for electron configuration

Postby Madison Hacker 1L » Sun May 06, 2018 6:04 pm

For those exceptions mentioned above, it is because it is more stable being half-filled and fully filled, so the electron configuration is changed.

Shione Nakahara 1F
Posts: 31
Joined: Fri Apr 06, 2018 11:04 am

Re: Exceptions for electron configuration

Postby Shione Nakahara 1F » Sun May 06, 2018 9:37 pm

For chromium and copper, a completely full or half full d-sublevel is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to the 3d orbital.


Return to “Electron Configurations for Multi-Electron Atoms”

Who is online

Users browsing this forum: No registered users and 2 guests