2 Exceptions to the Electron Configuration

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Victoria Luu - 1C
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

2 Exceptions to the Electron Configuration

Postby Victoria Luu - 1C » Wed Oct 24, 2018 7:41 pm

Why does Cr and Cu have the exception applied to them?

Andie Jian 1D
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Re: 2 Exceptions to the Electron Configuration

Postby Andie Jian 1D » Wed Oct 24, 2018 8:02 pm

Their p-orbitals of Cr and Cu only need one more electron to reach the much more stable state of all the p orbitals having 1 electron (5 in total), or 2 electrons in each orbital (10 in total). Therefore, in those cases, an electron will jump down from the higher energy s orbital to complete the orbitals in either of those ways.

Matthew Mar 1J
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Re: 2 Exceptions to the Electron Configuration

Postby Matthew Mar 1J » Thu Oct 25, 2018 1:54 pm

I think it's actually the d orbital that gets the electron, not the p orbital, since Cr: [Ar] 3d5 4s1
where putting the electron into the d orbital is actually more stable than putting it in to fill the s orbital like we'd expect ([Ar] 3d4 4s2).
The same goes with copper (Cu: [Ar] 3d10 4s1 rather than [Ar] 3d9 4s2).

yea-lyn pak_1G
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

Re: 2 Exceptions to the Electron Configuration

Postby yea-lyn pak_1G » Thu Oct 25, 2018 6:34 pm

The d orbital gets an extra electron, while the s orbital loses one, and this is so because it just makes the atom more stable.


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