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noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). The noble gases are colourless, odourless, tasteless, nonflammable gases.

Nitrous oxide (dinitrogen oxide or dinitrogen monoxide), commonly known as laughing gas, nitrous, or factitious air, among others, [4] is a chemical compound, an oxide of nitrogen with the formula N 2 O. At room temperature, it is a colourless non-flammable gas, and has a slightly sweet scent and taste. [4]

There are so many colorless gases in chemistry. Oxygen, nitrogen, methane are several examples. Colorless gases cannot be seen from our eyes. As an example, almost of all gases in the atmosphere are colorless. Therefore, we cannot observe a color in the atmosphere. Colorless gases can be categorized to different sections.

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