CCL: Madelung or Klechkovski /Aufbau principle

Title: Re: CCL: Madelung or Klechkovski /Aufbau principle
Can  someone explain how   Madelung-- Klechkovski (or Kelchkowki's) rule differ > from
the  Aufbau principle (Aufbauprinzip) described by Niels Bohr circa 1920?

No difference except the n + l rule gives the actual order, which is read off the empirical data.

Bohr's aufbau is that orbitals fill in order of increasing energy.
He could not derive this order, except empirically from spectra and chemical properties of atoms although he often gave the impression that he was deducing it from principles.  This has been written about by Kragh and myself in several articles.

The rule is just a convenient mnemonic for spelling out the aufbau.

eric scerri

 Kenneth Butenhof          phone:  800 756-4674
Principal Scientist          email:    kenb~!
Accelrys Inc.                   web:

"CCL" <owner-chemistry~!>
Sent by: owner-chemistry~!
09/29/2005 10:25 AM
Please respond to
"CCL Subscribers" <chemistry~!>

"Butenhof, Ken " <kenb~!>
CCL: Madelung or Klechkovski ?

Sent to CCL by: Anastassia Alexandrova []

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In Russia people teach Klechkovskyi rule. So another 1/6th of the World
thinks it was Klechkovskyi.

Anastassia Alexandrova, Ph.D.
Yale University
Department of Chemistry
225 Prospect Street
New Haven, CT 06520-8107
Phone: 203-432-6288
Fax: 203-432-6144

Quoting CCL <owner-chemistry~!>:

> Sent to CCL by: Paul Fleurat-Lessard
> []
> --Replace strange characters with the "at" sign to recover email
> address--.
> Dear Xavier,
> During my teaching experience in france, I also discovered that the
> Kelchkowki rules are, as we say in France, a cultural exception !
> While
> searching for the origin of these rules, I found that most of the
> countries refer to them as 'the aufbau principle' (something like the
> 'construction principle'), but I have no reference about it. May be
> some
> CCLers can help us on this !
> I took some time searching through some database, and Klechkowsky
> name
> never appeared...
> Regards,
> Paul.
> --
> Fleurat-Lessard Paul, Lecturer  e-mail:
> Paul.Fleurat-Lessard~!
> Laboratoire de Chimie
> Ecole Normale Supérieure de Lyon              Tel: + 33 (0)4 72 72 81
> 54
> 46, Allée d'Italie                            Fax: + 33 (0)4 72 72 88
> 60
> 69364 Lyon Cedex 07
> Si vous ne pouvez expliquer un concept à un enfant de six ans,
> c'est que vous ne le comprenez pas complètement.
>                   Albert Einstein
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Dr. Eric Scerri ,
4077C, Young Hall,
Department of Chemistry & Biochemistry,
607 Charles E. Young Drive East,
Los Angeles,  CA 90095-1569

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