CCL: Madelung or Klechkovski /Aufbau principle

[Eric Scerri <scerri~!~chem.ucla.edu>]

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.com
>  Accelrys
>  Inc.                  
>  web:     www.accelrys.com
>  
>  
>  "CCL"
>  <owner-chemistry~!~ccl.net>
>  Sent by: owner-chemistry~!~ccl.net
>  
> 09/29/2005 10:25
>  AM
> Please
>  respond to
>  "CCL Subscribers"
>  <chemistry~!~ccl.net>
>
> To
> "Butenhof, Ken
>  " <kenb~!~accelrys.com>
> cc
> Subject
> CCL: Madelung or
>  Klechkovski ?
>  
>  
>  
>  
>  
>  Sent to CCL by: Anastassia Alexandrova
>  [anastassia.alexandrova:+:yale.edu]
>  
>  --Replace strange characters with the "at" sign to recover
>  email address--.
>  
>  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
>  anastassia.alexandrova~!~yale.edu
>  http://zarbi.chem.yale.edu/~anastassia/
>  
>  
>  Quoting CCL <owner-chemistry~!~ccl.net>:
>  
>  >
>  > Sent to CCL by: Paul Fleurat-Lessard
>  > [Paul.Fleurat-Lessard:-:ens-lyon.fr]
>  >
>  > --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~!~ens-lyon.fr
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>  >
>  > 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 ,
UCLA,
4077C, Young Hall,

Department of Chemistry & Biochemistry,
607 Charles E. Young Drive East,
Los Angeles,  CA 90095-1569
USA

E-mail :   scerri~!~chem.ucla.edu
tel:  310 206 7443
fax:  310 206 2061
Web Page:    http://www.chem.ucla.edu/dept/Faculty/scerri/index.html

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Also see International Society for the Philosophy of Chemistry

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