Radon is everywhere in the world, but its concentrations in air are very different.
At room temperature radon is a gas.
At -50 0C radon is a gas.
Radon is a natural radioactive gas.
The state depends on the temperature and pressure. At STP, radon is a gas.
The element, Radon is one of the Noble Gases like Helium and Neon that do not form compounds. Thus Radon is always found in the Pure State.
One can order a radon testing kit from stores such as Lowes or Walmart. One can also order a radon testing kit by contacting one's state radon contact.
Radon is a gas at room temperature, and quite a bit below it, too. A link can be found below.
Radon is one of the noble gasses. As such, it exists naturally in its elemental state and does not easily form compounds.
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Radon exposure occurs when people breathe in radon gas, which is a naturally occurring radioactive element found in soil, rock, and water. Prolonged exposure to high levels of radon can increase the risk of lung cancer. Testing for radon levels in homes and workplaces is important for identifying and mitigating this risk.
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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.