Electron Configurations Stability

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Dan_Jin_1K
Posts: 15
Joined: Wed Sep 21, 2016 2:59 pm

Electron Configurations Stability

Postby Dan_Jin_1K » Thu Oct 27, 2016 12:44 am

For our periodic tables, why are some elements' electron configurations, for example, Cr: 3d5 4s1 written instead of Cr4 4s2?

Other examples
Nb: 4d4 5s1 instead of 4d3 5s2
Pt: 4f14 5d9 6s1 instead of 4f14 5d8 6s2

I understand that Pd removes the two electrons from the 5s orbital to fill up the 4d orbital, but I don't understand cases like the above mentioned one.

Thank you!

Anna_Kim_2E
Posts: 31
Joined: Wed Sep 21, 2016 2:56 pm

Re: Electron Configurations Stability

Postby Anna_Kim_2E » Thu Oct 27, 2016 9:00 am

Having a half full d5 or full d10 subshell has lower energy, therefore, where there is d4 or d9 subshell, it is better to move one electron from the 4s and fill the d subshell.


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