2A 5

Ziyan Wang 3J
Posts: 51
Joined: Wed Sep 18, 2019 12:22 am

2A 5

Give the ground-state electron configuration expected for each of the following ions: (a) Cu+ (b) Bi 3+ (c) Ga 3+ (d) Tl 3+

Kristina Rizo 2K
Posts: 105
Joined: Wed Sep 18, 2019 12:19 am

Re: 2A 5

Do you have a question regarding how to figure out the ground-state electron configurations?

Ziyan Wang 3J
Posts: 51
Joined: Wed Sep 18, 2019 12:22 am

Re: 2A 5

Kristina Rizo 3K wrote:Do you have a question regarding how to figure out the ground-state electron configurations?

Yes, I don't quite understand which electrons to remove.

Kristina Rizo 2K
Posts: 105
Joined: Wed Sep 18, 2019 12:19 am

Re: 2A 5

For a, the question is asking for the configuration of Cu+. The normal configuration for Cu is [Ar]3d^104s^1. The + charge on Cu means you are taking off one electron, so you would take off the electron from the furthest shell from the nucleus. In this case, it would be from the s-block, which would leave you with [Ar]3d^10.

Anthony Hatashita 4H
Posts: 103
Joined: Wed Sep 18, 2019 12:21 am

Re: 2A 5

For Ga+3 I believe the answer is [Ar]3d^10 because the 3d shell fills before the 4s does. You write the "largest" noble gas filled with electrons in brackets followed by the extra electrons.

Melvin Reputana 1L
Posts: 55
Joined: Sat Aug 17, 2019 12:16 am

Re: 2A 5

In order to decide which electrons are removed, I would write the ground-state electron configuration of the regular atom. Then I would remove electrons from the last orbital that has the highest energy level because it is the furthest away from the nucleus. I think this is where Dr. Lavelle's suggestion to write the electron configuration with the energy levels (n) being grouped together is helpful because it would help you see where the electrons would be removed/added.