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Update to electron configuration convention?

I have always understood electron configurations to reflect order of fill, that is, the 4s electrons are represented prior to the 3d electrons.  Scandium's electron configuration should be [Ar]4s2 3d1.  However, numerous web pages, supported by major universitites, indicate that is not a hard-and-fast rule, that electron configurations can be written in shell order, so scandium can just as properly be shown as [Ar]3d1 4s2.  An example:  Has the convention changed?

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Re: Update to electron configuration convention?

Dear Sir,

I have interest in this matter too.

I know the Pauli's exclusion principle, but I do not understand why.

I was taught about Hund's rule , but I do not know why it holds still now.

Methinks that the core problem lies in the mathematical content of the atomic orbital wave functions if they are valid assumption. I think that the 4S atomic orbital wave function for N protons nucleus must differ from the same 4S atomic orbital wave function for N+1 protons nucleus, and in the same way the energy levels that correspond to the p orbitals for N and N+1 protons nuclei are different.

First of all, I am suspicious about the current theory of atomic orbital.

I am waiting for someone to deliver the numerical or analytical solution of ab initio calculaiton for many electron atom.



June 18, 2013

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