1. The problem statement, all variables and given/known data Find wavelengths for Hg I lines belonging to one Rydberg series. We must use the NIST homepage to find the relevant wavelengths. 2. Relevant equations The problem I'm having is understanding exactly what a Rydberg series is. I seem to lack an understanding of Spectroscopic notation, and how it applies to this problem. I'm guessing I need to know the relevant atomic states that correspond to transitions in a Rydberg series. But, I don't know what a 'state' is.. We are given the example 6s6p 1P1 - 6sns 1S0. I'll try to breakdown what I understand. 6s6p refers to some electronic configuration of Hg I. 1P1 refers to some excited state. 6sns, not exactly sure what this means, but maybe n > 6 and thus this refers to some other electronic configuration. 1S0 refers to an excited state? If I can understand the meaning of the example, then I should be able to understand which state transitions correspond to a Rydberg series. Consequently, I can find the needed wavelengths myself. Any help is appreciated.