Only certain electron transitions are allowed from one energy level to another. In
Chapter 7, Problem 7.100(choose chapter or problem)
Only certain electron transitions are allowed from one energy level to another. In one-electron species, the change in the quantum number l of an allowed transition must be _1. For example, a 3p electron can drop directly to a 2s orbital but not to a 2p. Thus, in the UV series, where nfinal _ 1, allowed electron transitions can start in a p orbital (l _ 1) of n _ 2 or higher, not in an s (l _ 0) or d (l _ 2) orbital of n _ 2 or higher. From what orbital do each of the allowed electron transitions start for the first four emission lines in the visible series (nfinal _ 2)?
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