How do you modify the Bohr model equation for Li++?

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Homework Help Overview

The discussion revolves around modifying the Bohr model equation for the lithium ion (Li++) to determine the radius of an electron in the n = 4 level. The original poster references the standard formula used for hydrogen but encounters issues when applying it to Li++.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster questions why the standard formula for hydrogen does not yield the correct radius for Li++. Other participants suggest modifications to the formula, including multiplying by a factor related to the atomic number.

Discussion Status

Participants are exploring how to adapt the hydrogen model for Li++. There is an ongoing examination of the necessary modifications, with some suggestions being made, but no consensus has been reached on the correct approach yet.

Contextual Notes

It is noted that the original formula is specifically for hydrogen, and the implications of using it for a multi-electron system like Li++ are under discussion. The original poster's confusion indicates a potential misunderstanding of how atomic structure affects the application of the Bohr model.

Vitani11
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Homework Statement


Consider an electron in the n = 4 level of Li ++. According to the Bohr model, what is the radius of the orbit of the electron?

Homework Equations


r = .0529 nm

r(n) = (.0529 nm) x (n2)

The Attempt at a Solution


I thought this was pretty obvious? We want to know the radius of an electron in the n=4 level, using the equation does not give the right solution. Why? Why is this not working?
 
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The formula you are using is for the hydrogen atom. How do you modify this formula to handle Li++?
 
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TSny said:
The formula you are using is for the hydrogen atom. How do you modify this formula to handle Li++?

Multiply equation by 3?
 
TSny said:
The formula you are using is for the hydrogen atom. How do you modify this formula to handle Li++?
Got it, thanks!
 

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