Summary of how to write electron configurations please

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Darren Nguyen 1F
Posts: 60
Joined: Sat Sep 14, 2019 12:15 am

Summary of how to write electron configurations please

Postby Darren Nguyen 1F » Sun Oct 20, 2019 9:05 pm

Can someone explain

Kyla Grunden 1L
Posts: 46
Joined: Sat Sep 07, 2019 12:16 am

Re: Summary of how to write electron configurations please

Postby Kyla Grunden 1L » Sun Oct 20, 2019 9:13 pm

Hello,

There are several different ways to write electron configuration, but I think the best way if you're just learning this is to think about how many electrons can fit in each shell and subshell. To do this, here's a quick cheat sheet that will help you figure out the order electrons fill. You end up accidentally memorizing it pretty quickly!

https://www.google.com/imgres?imgurl=ht ... mrc&uact=8

For example Sodium has 11 electrons: it first fills 1s (2 electrons) then 2s (2 electrons), then 2p (6 electrons, we're now at 10 electrons total), and the remaining electron fills the 3s shell.

The configuration is 1s2 2s2 2p6 3s1.

Hope this helps!

EvaLi_3J
Posts: 53
Joined: Wed Oct 02, 2019 12:16 am

Re: Summary of how to write electron configurations please

Postby EvaLi_3J » Sun Oct 20, 2019 9:16 pm

I will try to be as comprehensive as possible, but if I missed anything, please correct me :)

1. know how many electrons this specific atom has
2. know the order in which subshells are filled
3. know how many electrons a specific subshell can take, for example, s has one orbital and can take 2 electrons, p has three orbitals and can take six, etc.
4. know how many subshells there are in each energy level: there is only the subshell s in energy level 1, s and p in energy level 2, etc.
5. be careful when the exceptions happen, see Hund's rule

You can check this page from WikiHow:
https://www.wikihow.com/Write-Electron- ... ny-Element


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