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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 (Rcolourless gasn), and oganesson (Og). The noble gases are colourless, odourless, tasteless, nonflammable gases.

Methane, colorless, odorless gas that occurs abundantly in nature and as a product of certain human activities. Methane is thecolourless gas simplest member of the paraffin series of hydrocarbons and is among the most potent of the greenhouse gases.

From green to pink hydrogen, we reveal the rainbow of hydrogen colours and the different types of technology used to produce each. Why is a colourless gas given so many colourful terms? Green hydrogen, blue hydrogen, brown hydrogen and even。

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