Copper exception

Moderators: Chem_Mod, Chem_Admin

705170809
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am
Been upvoted: 1 time

Copper exception

Postby 705170809 » Sun Oct 28, 2018 11:53 am

So I understand that the 4s^2 has a higher energy level than 3d^10 which is why it comes after 3d^10 say in element Bromine, however for Copper's electron configuration its exception makes it 3d^10 and 4s^1, but the 4s^1 is still after 3d^10, even though 4s^1 has a lower energy level than 3d^10, why is this?

Dimitri Speron 1C
Posts: 60
Joined: Fri Sep 28, 2018 12:17 am
Been upvoted: 1 time

Re: Copper exception

Postby Dimitri Speron 1C » Sun Oct 28, 2018 12:31 pm

This is because it is more stable for the entire 3d subshell to be filled than to have the 4s subshell with 2 and the 3d with 9. This is pretty much just how the math happens to work out and what is experimentally observed. A parallel to this is the electronic structure of Chromium, from the same subshell (3d) which has 3d5,4s1 instead of 3d4,4s2. Having this electron configuration is just more stable.

AngelaZ 1J
Posts: 65
Joined: Fri Sep 28, 2018 12:23 am

Re: Copper exception

Postby AngelaZ 1J » Sun Oct 28, 2018 3:01 pm

An electron configuration with a completely full or half full 3d subshell is more stable.

Chem_Mod
Posts: 17677
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 404 times

Re: Copper exception

Postby Chem_Mod » Sun Oct 28, 2018 5:35 pm

Put the above two together for the full answer.

Manas Jinka
Posts: 32
Joined: Fri Sep 28, 2018 12:26 am

Re: Copper exception

Postby Manas Jinka » Mon Oct 29, 2018 12:47 am

An entire 3d subshell that is full is stable instead of having 2 electrons in the 4s and 9 electrons in the 3d orbital


Return to “Electron Configurations for Multi-Electron Atoms”

Who is online

Users browsing this forum: No registered users and 0 guests