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Exceptions to electron configuration

Posted: Sun Oct 28, 2018 4:13 pm
by FrankieClarke2C
How are the exceptions to electron configuration determined? It explains in the textbook why they set up the configuration in certain elements this way but what differentiates copper and another metal?

Re: Exceptions to electron configuration

Posted: Sun Oct 28, 2018 4:44 pm
by Casandra
FrankieClarke4B wrote:How are the exceptions to electron configuration determined? It explains in the textbook why they set up the configuration in certain elements this way but what differentiates copper and another metal?


The exceptions to electron configuration are the groups of 6( chromium) and 11(copper). These two are exceptions because typically one would write the configuration of Copper as [Ar]3d^9 4s^2, however, it is more stable to have 10 electrons in the d orbital by taking one electron from the s-orbital. This means the new configuration of copper is [Ar]3d^10 4s^1. This is the same rule/exception for Chromium.

Re: Exceptions to electron configuration

Posted: Sun Oct 28, 2018 8:57 pm
by Jonathan Cheng 3C
This occurs because the electron is taking from the s orbital and added to the d orbital to make it more stable. The s orbital now is half filled, which is relatively stable and the the d orbital is completely filled which is stable as well.

Re: Exceptions to electron configuration

Posted: Mon Oct 29, 2018 10:28 am
by Nawaphan Watanasirisuk 3B
Are the 2 exceptions the only ones we need to know? It seems there are more as you go down the periodic table.