Electron configurations

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Annah Khan 1B
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Joined: Fri Jul 22, 2016 3:00 am

Electron configurations

Postby Annah Khan 1B » Sun Jul 02, 2017 5:36 pm

Hi, I was wondering why there are multiple ways of writing electron configurations? For example, why do we write the configuration for a magnesium atom as 1s^2 2s^2 2p^6 3s^2, as well as [Ne] 3s^2? What significance does the shorter version have compared to the longer version? Thank you in advance!

Posts: 21
Joined: Wed Nov 16, 2016 3:03 am

Re: Electron configurations

Postby sandraabdelmalak1D » Sun Jul 02, 2017 6:09 pm

Using the electron configuration of another element in brackets and then containing the configuration is just a shorthand way of writing the entire thing out. I don't think there's any particular reason other than that it is shorter, but I might be wrong.

Alma Cruz 1A
Posts: 21
Joined: Fri Jun 23, 2017 11:40 am

Re: Electron configurations

Postby Alma Cruz 1A » Sun Jul 09, 2017 9:17 pm

Just like Sandra said, there may not be any particular reason for writing the electron configuration shorter. We may be asked to write them out both ways, using the original element, or using its noble gas. We use the noble gas from the previous row the actual element is on when using the short version.

Kendall Schemmer 1I
Posts: 20
Joined: Fri Sep 29, 2017 7:03 am

Re: Electron configurations

Postby Kendall Schemmer 1I » Fri Oct 20, 2017 12:26 pm

To add on, the reason the noble gas from the previous row is used is because that element satisfies the configuration of all the electrons in the lower energy states. In other words, the configuration of the element you are working with will be the same up to that noble gas. After that, you drop down a row on the periodic table and the next state is reached.

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