exceptions: chromium & copper

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Leslie Cheng 4B
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Joined: Fri Sep 28, 2018 12:29 am

exceptions: chromium & copper

Postby Leslie Cheng 4B » Tue Oct 23, 2018 10:07 pm

In class, Dr. Lavelle talked about how chromium and copper are the two exceptions to electron configuration we should know. If chromium is [Ar] 3d^5 4s^1 and copper is [Ar] 3d^10 4s^1, does that mean in these elements, the 4s orbital is lower than the 3d orbital since the 4s state is not completely occupied yet?

Sameen Mahmood 3D
Posts: 37
Joined: Wed Jun 13, 2018 3:00 am

Re: exceptions: chromium & copper

Postby Sameen Mahmood 3D » Wed Oct 24, 2018 9:25 am

No, the rule for atoms after Z=20 having 4s higher than 3d still applies.

Zubair Ahmed 1L
Posts: 81
Joined: Fri Sep 28, 2018 12:16 am

Re: exceptions: chromium & copper

Postby Zubair Ahmed 1L » Wed Oct 24, 2018 11:25 am

No, the 3d orbital would still be considered to be at a a lower energy level than the 4s orbital regardless whether or not the 4s orbital is completely filled.

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