DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Helium-Neon elements. The atomic elements Helium and Neon are seen as a red laser beam shining through a prism, placed on the periodic table of the elements. These two elements: He (Helium) and Ne (Neon) are gases, which may be used to produce red He-Ne lasers.
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