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Ryan Cerny 3I
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Postby Ryan Cerny 3I » Tue Oct 11, 2016 10:21 pm

Dr. Lavelle mentioned that copper and chromium are exceptions to the rule for writing electron configurations of atoms; wouldn't that mean that all of the atoms within both of the groups in which copper and chromium belong?

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Re: Exceptions

Postby paulapedrani » Tue Oct 11, 2016 11:02 pm

I'm not quite sure what you mean, but if you look at the periodic table Lavelle provided, you can see the patterns of electron configuration there. There's usually a pattern, except when it gets to chromium, instead of following the trend and being [AR] 3d^4 4s^2, it became [AR]3d^5 4s^1. The electron, instead of filling up the 4s shell first, filled up the 3d shell with that one electron, leaving the 4s shell partially filled. The diagram, instead of looking like this:
4s: X
3d: / / / / _
Looks like this
4s: /
3d: / / / / /
Same thing happened with copper except it became 3d^10 4s^1 instead of 3d^9 4s^2
Hope this helps!!!

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