## ground state electron configuration

halle young 4A
Posts: 68
Joined: Thu Jul 11, 2019 12:16 am

### ground state electron configuration

Can someone please explain part A of this homework problem. I seemed to understand all of them but this part

2A.5 Give the ground state electron configuration expected for each of the following ions: (a) Cu+ (b) Bi3+ (c) Ga3+ (d) Tl3+

thank you!

kevinchang_4I
Posts: 55
Joined: Tue Nov 13, 2018 12:17 am

### Re: ground state electron configuration

This problem is just asking for the electron configuration of the ions. For example, Cu (copper) usually has an electron configuration of [Ar] 3d10 4s1, but because it is asking for the configuration of the ion Cu+ then we know it has one less electron. Therefore the configuration just is [Ar] 3d10

Kylie Lim 4G
Posts: 110
Joined: Sat Aug 17, 2019 12:15 am

### Re: ground state electron configuration

The + and 3+ charges tell you that you have a cation that lost electrons. To write the electron configuration just write the expected ground state, and remove the necessary amount of electrons. For example for Bi3+ the electron configuration for Bi is [Xe]5d106s26p3 and after removing 3 electrons becomes [Xe]5d106s2.

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

### Re: ground state electron configuration

If they asked for the electron configuration of an anion or a negative charge, you would just write out the electron configuration for the element normally, and then add an extra electrons to the end depending on the size of the negative charge.