What is the n value for Li2+ ion in the Bohr model of the atom?

  • Thread starter Thread starter physicsnobrain
  • Start date Start date
  • Tags Tags
    Hard
Click For Summary

Homework Help Overview

The discussion revolves around determining the n value for the Li2+ ion within the context of the Bohr model of the atom. Participants are exploring the implications of the equation for energy levels in hydrogen-like atoms, specifically focusing on the nuclear charge and its relation to the problem.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the significance of the nuclear charge (z) for Li2+ and question the original poster's interpretation of the problem. There is confusion regarding the variables involved, particularly z, n, and E.

Discussion Status

The discussion is ongoing, with participants providing insights into the nuclear charge of lithium and questioning the clarity of the original question. Some suggest that the question may need to be rephrased to make sense in the context of the Bohr model.

Contextual Notes

There is uncertainty regarding the original problem statement and whether it accurately reflects what is being asked about the Li2+ ion. Participants note that the charge of the nucleus for Li2+ is +3, which may influence the interpretation of the n value.

physicsnobrain
Messages
123
Reaction score
0

Homework Statement


In the equation for the bohr model of the atom, what is the n value for Li2+ ion?


Homework Equations


E = -2.178 x 10^-18J(z^2/n^2)


The Attempt at a Solution



Since it is Li2+ that means it has 1 electron. So z = 1. Now I have an equation with 2 variables (impossible to solve).

I don't know what E is and I have to find n. Does anyone have any idea on how to do this?
 
Physics news on Phys.org
z is the charge of the nucleus and is not 1 for Li.
For the rest, it may help to post the complete text of the problem.
 
nasu said:
z is the charge of the nucleus and is not 1 for Li.
For the rest, it may help to post the complete text of the problem.

It's Li2+ not Li. And this is the complete text of the problem...
 
It does not matter. The charge of the nucleus is 3e for Li, Li+, Li2+.
So z=3.

But n can take any value so the question does not seem to make sense.
 
IF the question is instead: In the equation for the bohr model of the atom, what is the z value for Li2+ ion?


Does this make more sense?
 
physicsnobrain said:
IF the question is instead: In the equation for the bohr model of the atom, what is the z value for Li2+ ion?


Does this make more sense?
Yes.
 
DrClaude said:
Yes.

Well isn't there still three unknown variables Energy and n value and z value?
 
But you are not asked to find all three, just to tell what (most likely) Z is.

As worded question doesn't make sense, unless it asks for Z, not n.
 
physicsnobrain said:
Well isn't there still three unknown variables Energy and n value and z value?

What is Z? What does it mean? What is Z for lithium?
(yay! 200th post)
 
  • #10
The question exactly as it appears word for word is: In the equation for the Bohr model of the atom, what is the Z value for Li2+ ion?

I am still unsure of how to go about this question. Which equation should I use?
 
  • #11
physicsnobrain said:
The question exactly as it appears word for word is: In the equation for the Bohr model of the atom, what is the Z value for Li2+ ion?

I am still unsure of how to go about this question. Which equation should I use?
You had the right equation in the OP. Go back in your notes/textbook and find what the ##Z## stands for.
 
  • #12
DrClaude said:
You had the right equation in the OP. Go back in your notes/textbook and find what the ##Z## stands for.

it stands for nuclear charge.
 
  • #13
And what is nuclear charge for lithium?
 
  • #14
Borek said:
And what is nuclear charge for lithium?

It is +3. So there is no need to use the equation for this problem? Seems more challenging than that.
 
  • #15
No, it is as simple as that. You were making it more difficult than it is from the very beginning.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 13 ·
Replies
13
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
Replies
3
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 1 ·
Replies
1
Views
5K