How many spectral series are possible in the hydrogen spectrum?

1.	How many spectral series are possible in the hydrogen spectrum?
Answer» Infinite. The last (sixth) of the named series in the hydrogen spectrum is the Humphreys series which results from transitions to n_f = 6 from n_i = 7, 8, 9, … etc. in the far-infrared region. Further series are unnamed but follow the same pattern. Their lines are increasingly faint showing that they correspond to increasingly rare atomic events. [Note : There are infinite number of lines in each series. The spacing between adjacent lines decreases with decreasing wavelength, converging to the so-called series limit or short-wavelength limit.]

Answer»

Infinite. The last (sixth) of the named series in the hydrogen spectrum is the Humphreys series which results from transitions to n_f = 6 from n_i = 7, 8, 9, … etc. in the far-infrared region. Further series are unnamed but follow the same pattern. Their lines are increasingly faint showing that they correspond to increasingly rare atomic events.

[Note : There are infinite number of lines in each series. The spacing between adjacent lines decreases with decreasing wavelength, converging to the so-called series limit or short-wavelength limit.]

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