aufbau principle

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Aashka Popat 1A
Posts: 50
Joined: Sat Sep 07, 2019 12:16 am

aufbau principle

Postby Aashka Popat 1A » Sun Nov 03, 2019 11:52 pm

What is the Aufbau principle and why does the 4s subshell have lower energy than the 3d subshell?

Micah3J
Posts: 100
Joined: Tue Oct 08, 2019 12:16 am

Re: aufbau principle

Postby Micah3J » Sun Nov 03, 2019 11:57 pm

Will we need to know the f block for the midterm?

christabellej 1F
Posts: 109
Joined: Sat Aug 17, 2019 12:17 am

Re: aufbau principle

Postby christabellej 1F » Mon Nov 04, 2019 8:06 am

The Aufbau principle is the building up principle that combines both Pauli Exclusion principle and Hunds rule. Pauli Exclusion principle states that there can be a max of two electrons per orbital and that the two electrons must be spin paired. Hunds rule states that the electrons should be placed one per orbital first in a parallel manner. The 4s subshell only has lower energy if the 3d subshell is not filled yet. Once the 3d subshell has electrons within it, then it has lower energy than the 4s.

Ashley Tran 2I
Posts: 108
Joined: Thu Jul 11, 2019 12:17 am

Re: aufbau principle

Postby Ashley Tran 2I » Mon Nov 04, 2019 8:58 am

Micah3J wrote:Will we need to know the f block for the midterm?


No, we need to know s, p, and d.

Robin Cadd 1D
Posts: 113
Joined: Thu Jul 11, 2019 12:16 am

Re: aufbau principle

Postby Robin Cadd 1D » Mon Nov 04, 2019 9:57 am

Anything past the 3d block we don't need to know.


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