## ch3 #5 6th edition

805098281
Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

### ch3 #5 6th edition

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

I know that you're supposed to use brackets with the element from the last column on the row above as a shortcut, but I'm confused on how to set up the rest of the configuration.

Emily Li 4A
Posts: 24
Joined: Fri Sep 28, 2018 12:27 am

### Re: ch3 #5 6th edition

805098281 wrote:Give the ground-state electron configuration expected for each of the following ions: a) Cu+ b) Bi^3+ c) Ga^3+. d) Tl^3+

I know that you're supposed to use brackets with the element from the last column on the row above as a shortcut, but I'm confused on how to set up the rest of the configuration.

For these questions, it's helpful to first write out the configuration for the element. Copper has an exception, though; its electron configuration is [Ar]3d104s1. Thus, for the configuration of Cu+ you subtract one electron to have [Ar]3d10.

For Bi^3+, the configuration for Bi is Xe 4f14 5d10 6s2 6p3 (it's important to get the order of these terms right, or else you would subtract the wrong number of electrons from the unintended orbital). Since the anion has a 3+ charge, you would subtract three electrons from the Bi configuration, leaving you with: Xe 4f14 5d10 6s2.

For the rest of the problems use these steps in the same manner. If you need help on finding the exact order of the orbitals, it helps to search up complicated electron configurations and tracing the order of the orbitals on a periodic table to get the gist.