Neon atoms generate far more yellow and red photons than blue and violet photons, the neon "open" sign appears reddish-orange.
A chemical element's or compound's emission spectrum is the range of electromagnetic radiation frequencies that are released by an atom or molecule when it transitions from an excited state with high energy to a more relaxed state with reduced energy.
When activated in this manner, neon releases red light. Different gases emit different hues. A line emission spectrum is created by the light that is released. In a fluorescent lamp, mercury vapor in argon or neon gas is excited by electricity to create a plasma that emits short-wave ultraviolet light. This process is similar to that in a gas discharge lamp.
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