Aufbau

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Sukanya Mohapatra 2G
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Joined: Sat Aug 17, 2019 12:18 am
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Aufbau

Postby Sukanya Mohapatra 2G » Sat Oct 19, 2019 4:02 pm

Can someone explain the Aufbau Principle in greater detail?

Cooper Baddley 1F
Posts: 100
Joined: Wed Sep 18, 2019 12:19 am

Re: Aufbau

Postby Cooper Baddley 1F » Sat Oct 19, 2019 4:09 pm

The Aufbau principle states that you start filling the lower energy subshells before continuing on to the ones with the higher energy. So for example you wouldn't start filling up 2p before filling 2s

Alice Chang 2H
Posts: 101
Joined: Fri Aug 30, 2019 12:18 am

Re: Aufbau

Postby Alice Chang 2H » Sat Oct 19, 2019 4:09 pm

Here's some info I found by a Google search online here: https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configurations/Aufbau_Principle
Aufbau comes from the German word "Aufbauen" which means "to build". In essence when writing electron configurations we are building up electron orbitals as we proceed from atom to atom. As we write the electron configuration for an atom, we will fill the orbitals in order of increasing atomic number. The Aufbau principle originates from the Pauli’s exclusion principle which says that no two fermions (e.g., electrons) in an atom can have the same set of quantum numbers, hence they have to "pile up" or "build up" into higher energy levels. How the electrons build up is a topic of electron configurations.


Though I find this video to be more helpful visually, although they never specifically say it's the Aufbau principle:
https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/electron-configurations-jay-sal/v/electron-configurations-2

There's also some videos online that may help explain it further. Hope this helps somehow!

805422680
Posts: 103
Joined: Sat Sep 14, 2019 12:16 am

Re: Aufbau

Postby 805422680 » Sat Oct 19, 2019 4:11 pm

The Aufbau Principle states that the orbitals with the lower energy level get filled with electrons before the higher energy level. Thus, this gives us information about the electronic configuration of the atom.


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