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In its gaseous state it is colorless, but when it freezes at -71°C the cooled, solid radon emits a pale yellow light. On intense cooling, it glows

with a orangish color.

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12y ago

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What color is radon in a tube?

Radon is a colorless gas.


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In the gaseous (normal) state, radon is a colorless gas, as is true of all noble gases (see: xenon, krypton, neon, argon, helium). Due to its high radioactivity a radon light is impractical, but if one were constructed it would glow yellow-green. In the solid state, things get very interesting with radon. As radon solidifies, it glows yellow, and then with decreasing temperature, glows an angry orange-red. This glow, or nightshine, comes from the Cerenkov light -- a product if radon's intense radioactivity. Needless to say, if you ever are viewing a glowing radon tube, you had best be standing behind very thick leaded glass.


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Radon is a colorless, odorless, and tasteless gas that is chemically inert, which means it is neither shiny nor dull because it is a gas at room temperature and does not have a physical appearance like a solid or liquid substance.


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