Which gases are commonly used in neon lights?

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The gases commonly used in neon lights include argon, xenon, and neon. In traditional neon lighting, neon gas is specifically used to produce the characteristic bright red-orange glow. However, other noble gases such as argon and xenon can also be used depending on the desired color effect.

While argon and neon are frequently seen, the inclusion of xenon enhances the range of colors available in neon signage. Argon emits a purple light when ionized, and when mixed with phosphor coatings, it can create various colors as well.

The other sets of gases listed do not serve the same function in neon lighting. Helium and krypton, while they may be found in certain types of lights or for different applications, are not the primary gases used in traditional neon signage. Similarly, chlorine, radon, carbon dioxide, hydrogen, methane, and oxygen are not used in neon lights due to their reactivity or unsuitable properties for creating the desired illumination. Therefore, the gases most commonly utilized in neon lights are argon, xenon, and neon.