Writing Electron Configurations for ions

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Remi Lathrop 1G
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

Writing Electron Configurations for ions

Postby Remi Lathrop 1G » Thu Nov 02, 2017 10:08 pm

In the beginning problems from chapter 3, number 5 asks us to write electrons configurations for ions like Cu+ and Ga+. I assumed that the configuration for Cu+ would look something like [Ar] 3d^8 4s^2, but the solutions manual has the solution as [Ar] 3d^10.

Why do the electrons fill the 3d subshell but empty the 4p subshell? Is there some kind of rule we can apply to all ion configurations or is this just a case by case situation?

Golbarg Rahimi 3k
Posts: 26
Joined: Sat Jul 22, 2017 3:01 am

Re: Writing Electron Configurations for ions

Postby Golbarg Rahimi 3k » Thu Nov 02, 2017 10:43 pm

if you start by writing the electron configuration of Cu in its ground state, you will have [Ar]3d104s1
now if you take one electron away from the outer shell to get the ion, you will have [Ar]3d10.

Ammar Amjad 1L
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am
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Re: Writing Electron Configurations for ions

Postby Ammar Amjad 1L » Fri Nov 03, 2017 6:46 pm

Cu^+ is a cation; therefore, you would remove the outermost electron. The person above me wrote the electron configuration for it.

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