Electron Configurations

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Emily Orozco L4
Posts: 45
Joined: Fri Sep 28, 2018 12:29 am

Electron Configurations

Postby Emily Orozco L4 » Sun Oct 28, 2018 10:51 pm

For Cu 2+, why does {Ar} 3d^10 4s^1 become [Ar] 3d^9

Kathryn 1F
Posts: 66
Joined: Fri Sep 28, 2018 12:19 am

Re: Electron Configurations

Postby Kathryn 1F » Sun Oct 28, 2018 10:55 pm

Hi! Because to form a positive charge, 2 electronsust be removed. They are removed from the highest energy states, in this case 4s and the last 3d

Yvonne Du
Posts: 64
Joined: Fri Sep 28, 2018 12:23 am

Re: Electron Configurations

Postby Yvonne Du » Sun Oct 28, 2018 11:10 pm

You remove electrons starting with the highest level. Since there is only one electron in the 4s shell, you need to subtract another electron from the 3d shell.

Hope this helps.

Maxwell S 3E
Posts: 15
Joined: Fri Sep 28, 2018 12:24 am

Re: Electron Configurations

Postby Maxwell S 3E » Sun Oct 28, 2018 11:31 pm

As seen before, they stated that electrons have been removed from Cu to Cu+2, denoting that it is positive in charge so there are less electrons (e-). Then, every energy level requires more and more energy to hold electrons, so naturally they will be released first.


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