Which of the following electron configurations of neutral atoms represent excited

QuestionsCategory: ChemistryWhich of the following electron configurations of neutral atoms represent excited
Lisa Howell asked 5 months ago
Which of the following electron configurations of neutral atoms represent excited states?

( ) [Xe]6s24f1
( ) 2s2
( ) 1s22s22p63s23p63d2
( ) [Ar]4s23d3
( ) [Kr]5s14d5

7 Answers
Lisa Howell answered 5 months ago
Add spaces to make your problem more readable. Don’t run the numbers together.
1) 6s2 4f1?
2) 2s2
3) 1s2 2s2 2p6 3s2 3p6 3d2
4)4s2 3d3
5)5s1 4d5

Here is how you do this. I’ll do the first one or two.
#1. Count the electrons. I count 57. Look up element #57 and I see Lu. Go to http://www.webelements.com and click on Lu. Scroll down to electron shell properties, click on that, and see that the ground state for Lu is [Xe]5d1 6s2 and that makes [Xe]6s2 4f1 an excited state.
#2 is He and that is the ground state.
#3 is Ca.
I’ll be glad to check the others for you.

Lisa Howell answered 5 months ago
I have counted the electrons for all of the five electron configurations. I have determined that as you mentioned [Xe]6s2 4f1 is the excited state of Lu. I also managed to find that the configuration 1s2 2s2 2p6 3s2 3p6 3d2 is the excited configuration of Ca. But I am told that there are three excited electron configurations given. I cannot find the third.

Lisa Howell answered 5 months ago
Basically what I have found is:
1) excited Lu
2) He
3) excited Ca
4) V
5) Mo

Lisa Howell answered 5 months ago
2s2 is the excited version of He. The ground state version is 1s2

Lisa Howell answered 5 months ago
12345

Lisa Howell answered 5 months ago
[Xe]6s24f1
2s2

Lisa Howell answered 5 months ago
ds

Do NOT follow this link or you will be banned from the site!