expected electron configuration of chromium  [ENDORSED]

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Rain Taganas 1J
Posts: 22
Joined: Fri Sep 29, 2017 7:05 am

expected electron configuration of chromium

Postby Rain Taganas 1J » Sun Oct 22, 2017 1:08 am

Why is the expected electron configuration for chromium different from the observed electron configuration? The expected configuration is [Ar]4s2,3d4 and the observed configuration is [Ar]4s1,3d5.

skalvakota2H
Posts: 52
Joined: Sat Jul 22, 2017 3:01 am

Re: expected electron configuration of chromium  [ENDORSED]

Postby skalvakota2H » Sun Oct 22, 2017 10:39 am

Chromium acts like an exception in the sense that 3d5 is a more stable configuration than 3d4, the reason being that an exactly half filled sub-shell is partially full is more stable than a partially sub-shell. As a result, an electron from the 4s orbital is excited and rises to the 3d orbital.

Katherine Jordak 1H
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am

Re: expected electron configuration of chromium

Postby Katherine Jordak 1H » Sun Oct 22, 2017 4:36 pm

For similar reasons, Copper is also an exception to that normal electron configuration rule. Its electron configuration is [Ar]4s1,3d10. A completely filled sub-shell will be more stable than a partially filled one.

deeksha1I
Posts: 21
Joined: Fri Sep 29, 2017 7:04 am

Re: expected electron configuration of chromium

Postby deeksha1I » Sun Oct 22, 2017 5:15 pm

Are copper and chromium the only elements that are like this?


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