Exceptions for Electron Configuration
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Exceptions for Electron Configuration
In the lecture on Friday 10/18, professor mentioned how there exists EXCEPTIONS that half full d subshells and full d subshells have lower energy. Does anyone remember what this is exception to?
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Re: Exceptions for Electron Configuration
He said the two exceptions were for the elements copper (Cu) and chromium (Cr)
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Re: Exceptions for Electron Configuration
I believe they were copper (Cu) and chromium (Cr). The configuration for copper would be [Ar]3d10 4s1 and chromium would be [Ar]3d5 4s1.
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Re: Exceptions for Electron Configuration
The norm is that the 4s orbital would fill up before the 3d orbital, so each element would have 4s^2 before 3d. However, in both Cu and Cr, the 4s orbital is not full, while the 3d orbital is partially full or completely full (3d^5 or 3d^10) for the purposes of stability. This is why they are called exceptions.
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Re: Exceptions for Electron Configuration
For the exceptions, this is since half full d5 and full d10 subshells have lower energy. As an example he compared Titanium and Vanadium to Copper and Chromium.
Re: Exceptions for Electron Configuration
exceptions for electron configurations:
Cu-(Ar)3d^10 4s^1.
Cr-[Ar] 3d5 4s1
Cu-(Ar)3d^10 4s^1.
Cr-[Ar] 3d5 4s1
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Re: Exceptions for Electron Configuration
the examples he gave in class were copper and chromium, however, this does not mean those elements are the only exceptions, period 5 on the periodic table follows the same trend.
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