HW 2A.21d

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Amy Pham 1D
Posts: 103
Joined: Fri Aug 09, 2019 12:15 am

HW 2A.21d

Postby Amy Pham 1D » Sun Oct 27, 2019 5:51 pm

Why is the electron configuration for Ag: [Kr]4d10 5s1 instead of [Kr]4d9 5s2? By the rules that we were taught, shouldn't it be the latter?

Following this, I understand that starting with the correct electron configuration makes the configuration for Ag+: [Kr]4d10, with no unpaired electrons. I'm just confused as to how we were supposed to know the original electron configuration for Ag.

Maya Serota 3G
Posts: 53
Joined: Tue Sep 24, 2019 12:17 am

Re: HW 2A.21d

Postby Maya Serota 3G » Sun Oct 27, 2019 5:59 pm

I am also confused about this question. I looked it up and the answer differs on various websites. Anyone who can clarify would be much appreciated!

DTingey_1C
Posts: 55
Joined: Fri Aug 30, 2019 12:16 am

Re: HW 2A.21d

Postby DTingey_1C » Sun Oct 27, 2019 8:17 pm

I believe Lavelle mentioned this odd configuration along with one other one that I am forgetting right now. He said that these two configurations are anomalies that we just have to memorize without much further explanation. Some areas of chemistry (and science in general) are proven experimentally but can't be explained. This is probably one of those areas. Sorry if this is a limited explanation but this is all I remember him saying.

jvera4b
Posts: 60
Joined: Wed Sep 11, 2019 12:17 am

Re: HW 2A.21d

Postby jvera4b » Sun Oct 27, 2019 8:23 pm

DTingey_1C wrote:I believe Lavelle mentioned this odd configuration along with one other one that I am forgetting right now. He said that these two configurations are anomalies that we just have to memorize without much further explanation. Some areas of chemistry (and science in general) are proven experimentally but can't be explained. This is probably one of those areas. Sorry if this is a limited explanation but this is all I remember him saying.

Additionally I think it has to do with the fact that a half full d shell is more stable.

Maya Gollamudi 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: HW 2A.21d

Postby Maya Gollamudi 1G » Sun Oct 27, 2019 8:38 pm

Ag is one of the exceptions to the usual electron configuration pattern. Since a full d-shell is much more stable than a partially full d-shell (d9), the electron configuration becomes [Kr]4d10 5s1.

Amy Pham 1D
Posts: 103
Joined: Fri Aug 09, 2019 12:15 am

Re: HW 2A.21d

Postby Amy Pham 1D » Mon Oct 28, 2019 6:15 pm

The two elements that he told us were exceptions were chromium (Cr) and copper (Cu), so I'm assuming silver would be another exception based on the fact that it is in the same group as copper?


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