Electron Configuration and d-block (3.11)

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Sara Sasaki 1K
Posts: 48
Joined: Fri Sep 29, 2017 7:05 am

Electron Configuration and d-block (3.11)

Postby Sara Sasaki 1K » Mon Nov 06, 2017 11:33 pm

Hi everyone,
I am confused on understanding the electron configuration of certain elements in the d-block. I had thought the only exceptions were Cu, Cr, and Ag, and everything else continued with the trend of filling the s-block then d-block. But, for example, Ruthenium has the configuration [Kr] 4d75s1 and not [Kr] 4d65s2.
Can someone please explain this to me? Thank you!

104922499 1F
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Re: Electron Configuration and d-block (3.11)

Postby 104922499 1F » Tue Nov 07, 2017 10:27 am

also confused on this question...

Jason Muljadi 2C
Posts: 62
Joined: Thu Jul 27, 2017 3:01 am

Re: Electron Configuration and d-block (3.11)

Postby Jason Muljadi 2C » Thu Nov 09, 2017 2:53 pm

The 5th period is where things get a little funky, so I don't think you have to worry about those elements too much. The short answer is that it's more stable when it has that configuration you are talking about, instead of what we expected to get. When you're dealing with 4d, the more stable configurations happen with d3 and d8. So instead of being in that awkward, unstable d6 configuration, Ruthemium goes to d7, which is closer to the d8 configuration.

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