The inert gas Crypton (Kr) seen in a discharge tube emits light due to an electric field.

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Photo credit: © Kim Christensen / Alamy / Afripics
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Keywords: 8, chemistry, color, colorful, crypton, discharge, education, element, emission, excite, fluorescense, gas, group, illuminated, inert, kr, krypton, light, periodic, physics, science, table, tube