Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Electronic configuration of Cr and Cu
r15h4bh
Harmless
*




Posts: 16
Registered: 19-12-2012
Member Is Offline

Mood: No Mood

[*] posted on 19-12-2012 at 16:29
Electronic configuration of Cr and Cu


Hello everyone :D

I just learnt about the "Wave Mechanical Model" and we learnt a little (very little, about a paragraph) about Aufbau principle, Pauli's exclusion principle and Hund's rule. They gave the electronic configuration of the first 30 elements and I noticed that Chromium and Copper have abnormal electronic configurations. For example,

Cu: [Ar]4s13d10

But if it were to follow what I learnt from the Aufbau principle, then it should be,

Cu: [Ar]4s23d9

So can anyone explain the reason for their abnormal electronic configurations? Please don't go into advanced Chemistry, I just started the basics, so I'm hoping you can explain it in a way that I'll understand :)
View user's profile View All Posts By User
Lambda-Eyde
International Hazard
*****




Posts: 856
Registered: 20-11-2008
Location: Norway
Member Is Offline

Mood: Cleaved

[*] posted on 19-12-2012 at 16:56


http://en.wikipedia.org/wiki/Electron_configuration#Ionizati...



This just in: 95,5 % of the world population lives outside the USA
You should really listen to ABBA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
View user's profile View All Posts By User
smaerd
International Hazard
*****




Posts: 1262
Registered: 23-1-2010
Member Is Offline

Mood: hmm...

[*] posted on 19-12-2012 at 17:20


Of course, this has to do with Hund's rule. However, half-filled electron configurations are particularly stable so there is an energetic reason for these abnormalities. For example we would assume Chromium to be 4s2 3d4, but the pairing energy of the S orbital is less favorable then giving both the S as well as the D electrons half filled shells edit(forgot to include)- 4s1 3d5.Hope this makes sense.

[Edited on 20-12-2012 by smaerd]




View user's profile View All Posts By User
r15h4bh
Harmless
*




Posts: 16
Registered: 19-12-2012
Member Is Offline

Mood: No Mood

[*] posted on 19-12-2012 at 18:53


Thanks a lot! :D I saw that wiki page, but that was a bit too complex for me, so I'm content knowing that it is somehow more stable. As I learn more, when I come back to the topic I should be able to understand the more complicated reasoning behind it :) But I'd rather not confuse myself for now.
View user's profile View All Posts By User
chemrox
International Hazard
*****




Posts: 2956
Registered: 18-1-2007
Location: UTM
Member Is Offline

Mood: LaGrangian

[*] posted on 20-12-2012 at 15:08


That's a good wiki. Also you can get 81/2 x 11 periodic tables that have ground state configs for the elements. Three hole punched as well!



"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
View user's profile View All Posts By User
r15h4bh
Harmless
*




Posts: 16
Registered: 19-12-2012
Member Is Offline

Mood: No Mood

[*] posted on 20-12-2012 at 17:29


What do you mean?
View user's profile View All Posts By User
smaerd
International Hazard
*****




Posts: 1262
Registered: 23-1-2010
Member Is Offline

Mood: hmm...

[*] posted on 20-12-2012 at 17:59


He means you can print out periodic tables that fit on printer paper that include the electron configuration



View user's profile View All Posts By User
r15h4bh
Harmless
*




Posts: 16
Registered: 19-12-2012
Member Is Offline

Mood: No Mood

[*] posted on 21-12-2012 at 17:01


Ohhh. Sorry :P
View user's profile View All Posts By User
platedish29
Hazard to Self
**




Posts: 76
Registered: 2-9-2012
Member Is Offline

Mood: absorbing CO2

[*] posted on 29-12-2012 at 20:41


I don't check if that divergence holds too long..
Maybe thats just a tale clue on your calculators spectrum.

[Edited on 30-12-2012 by platedish29]
View user's profile View All Posts By User

  Go To Top