Chemistry
posted by Lauren .
What is the wavelength of the transition from n=4 to n=3 for Li2+? In what region of the spectrum does this emission occur? Li2+ is a hydrogenlike ion. Such an ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels of the ion are Z^2RH/n^, where Z is the atomic number
Where do I begin on this Im so confused

Start with the Rydberg equation.
http://en.wikipedia.org/wiki/Rydberg_formula
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