Copper and Chromium  [ENDORSED]

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veneziaramirez 3I
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am

Copper and Chromium

Postby veneziaramirez 3I » Sun Oct 29, 2017 11:26 pm

What is the exception with Copper and Chromium?

Jessica Wakefield 1H
Posts: 58
Joined: Thu Jul 27, 2017 3:00 am

Re: Copper and Chromium

Postby Jessica Wakefield 1H » Sun Oct 29, 2017 11:44 pm

For copper the electron configuration is [Ar] 3d10 4s1. The exception is that the 3d comes before the 4s because the d sub-level is more stable than a partially filled d sub-level.

Derek Waters 1A
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Joined: Thu Jul 13, 2017 3:00 am

Re: Copper and Chromium  [ENDORSED]

Postby Derek Waters 1A » Mon Oct 30, 2017 12:46 am

for Chromium it is still the 3d coming before the 4s as its configuration is [Ar] 3d5 4s1

Posts: 22
Joined: Fri Sep 29, 2017 7:07 am

Re: Copper and Chromium

Postby altaing » Wed Nov 01, 2017 5:52 pm

Why is it more stable?

Thuy-Anh Bui 1I
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Re: Copper and Chromium

Postby Thuy-Anh Bui 1I » Wed Nov 01, 2017 9:37 pm

These configurations for copper and chromium are more stable because they result in a more symmetric distribution of the electrons.

For chromium, the electron configuration [Ar]3d5 4s1 distributes the 6 valence electrons evenly. 5 electrons fill the 5 d-orbitals and 1 electron fills the single s-orbital. This distribution is more stable because the electrons are spread out to reduce electron-electron repulsion.

For copper, the electron configuration [Ar]3d10 4s1 fills the d-orbital for stability. These more stable distributions can be seen in the picture below.


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