Energy-Level Diagram Plot
An energy-level diagram plots energy vertically and is useful in visualizing the energy states of a system and the transitions between them. This diagram is for the hydrogen-atom electrons, showing a transition between two orbits having energies
Source
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"OpenStax College, Bohr’s Theory of the Hydrogen Atom. January 28, 2013."
http://cnx.org/content/m42596/latest/
OpenStax CNX
CC BY 3.0.