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Emission Spectrum Of Helium Photograph by Dept. Of Physics, Imperial College/science Photo Library - Pixels
A special type of fluorescent tube contains the gas helium. When energized, it is lit by certain colors. What is this process where colored light is emitted from an atom? - Quora
Atomic Spectra
Photograph | Emission Spectrum of Helium | Science Source Images
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File:Atomic emission spectrum of helium.svg - Wikimedia Commons