Aufbau Principle

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Sally kim 4F
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Aufbau Principle

Postby Sally kim 4F » Sun Oct 20, 2019 2:09 pm

What is the Aufbau Principle and how does it relate to electron configuration?

Joelle 3L
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Joined: Sat Jul 20, 2019 12:16 am

Re: Aufbau Principle

Postby Joelle 3L » Sun Oct 20, 2019 2:14 pm

The Aufbau principle means that electrons are added to orbitals as protons are added to the atom. Therefore, lower electron orbitals fill before the higher orbitals. This process can be seen as "building up" the electron shell. It outlines the rules on how electrons are organized in electron configuration.

Sanjana K - 2F
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Re: Aufbau Principle

Postby Sanjana K - 2F » Sun Oct 20, 2019 2:20 pm

It's basically the "building up" principle, which helps you determine electron configuration. It says electrons with lower energy levels with tend to fill up first. Here's a diagram of the order.

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Re: Aufbau Principle

Postby philipraj_1F » Sun Oct 20, 2019 2:24 pm

You also need to know that there are exceptions to it with the 4s and 3d orbitals when the s orbitals lose an electron to the d orbitals.

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