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Hydrogen Atom: Line Spectra and the Bohr Model

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A singly ionized helium atom (He+) has only one electron in orbit about the nucleus. What is the radius of the ion when it is in the n = 3 excited state?

I have an idea of how to do the problem, but that is with hydrogen. Please help and thank you very much!

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This solution discusses how to measure the radius of an ion in the hydrogen atom.

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