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

[Vitani11]

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?

 

[TSny]

The formula you are using is for the hydrogen atom. How do you modify this formula to handle Li⁺⁺?

 

[Vitani11]

The formula you are using is for the hydrogen atom. How do you modify this formula to handle Li⁺⁺?

Multiply equation by 3?

 

[Vitani11]

The formula you are using is for the hydrogen atom. How do you modify this formula to handle Li⁺⁺?

Got it, thanks!