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## Homework Statement

Using the Bohr model, find the atomic radius for a singly ionized He+ atom in the n =

1 (ground) state and the n = 2 (first excited) state. Then find the wavelength of the

emitted photon when an electron transitions from the n = 2 to the n = 1 state.

## Homework Equations

[tex]a_0 = \frac{4∏e_0h^2}{me^2}[/tex]

m = mass of the electron

h = h bar. Reduced Planck's constant

e = elementary charge

## The Attempt at a Solution

I need some way of adding a proton and a neutron to the equation, but there's no such variable. I can't find any equation relating to the Bohr radius that isn't just constants. The Borh model can supposedly give you the radius of a helium cation, but that's the only equation I can find and it's all constants.

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