Cu2+ configuration

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Artin Allahverdian 2H
Posts: 76
Joined: Fri Sep 28, 2018 12:26 am

Cu2+ configuration

Postby Artin Allahverdian 2H » Tue Oct 30, 2018 8:29 pm

Can someone please explain why the electron configuration for Cu2+ is [Ar]3d^9 and not [Ar]3d^8 4s^1? Thanks!

Becky Belisle 1A
Posts: 81
Joined: Fri Sep 28, 2018 12:18 am

Re: Cu2+ configuration

Postby Becky Belisle 1A » Tue Oct 30, 2018 8:52 pm

It is easier to remove the outermost electrons, which are the ones in 4s.

Imelda Mena 3I
Posts: 51
Joined: Thu Oct 02, 2014 3:00 am

Re: Cu2+ configuration

Postby Imelda Mena 3I » Wed Oct 31, 2018 8:26 pm

Yea! It is easier to remove the electrons that are on the outer shell. I think it helps if you start with the electron configuration of Cu first which from lecture we know it is one of the special exceptions as (Cu): [Ar] 3d^104s^1. From there you can see that the electron configuration for the ion Cu2+ would be 3d^9 because copper has lost 2 electrons, one is taken away from the s-orbital first and then you move on to take away another one from the d-orbital. Just remember that you always want to remove electrons from the outer shells first when you have a cation (positively charged ion). Hope this helps!

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