Electron Configuration Sequence

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Francesca Genera 3F
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Electron Configuration Sequence

Postby Francesca Genera 3F » Thu Oct 08, 2015 10:01 am

When writing an electron configuration for Vanadium (or any other element in the d-block), why does the 3d come before the 4s? For Vanadium, why is it (Ne)3s^2 3p^6 3d^3 4s^2 and not (Ne)3s^2 3p^6 4s^2 4d^3? I just don't understand why the number associated with the d series is always one less than the row it is on in the periodic table.

KaylaH
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: Electron Configuration Sequence

Postby KaylaH » Thu Oct 08, 2015 11:11 am

Vandium is usually written as [Ar] 4s2 3d3, and the 4s2 is written before the 3d3 because it is actually in a lower energy state than the 3d3.


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