The emission spectrum below for a one-electron (hydrogen-like) species in the gas phase shows all the lines, before they merge together, resulting from transitions to the first excited state from higher energy states. Line A has a wavelength of 434 nm.

(a) What are the upper and lower principal quantum numbers corresponding to the lines labeled A and B?

(b) Identify the one-electron species that exhibits the spectrum.

Transcribed Image Text:

BA Increasing wavelength,