what are noble gases? why are they called inert gases?
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The science. The noble gases, in order of their density, are helium, neon, argon, krypton, xenon and radon. They are called noble gases because they are so majestic that, in general, they don't react with anything. For this reason they are also known as inert gases.
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Elements of group 18 are all gases and have completely filled outermost orbital that’s why these elements are highly stable and don’t react with other elements easily. This is the reason these elements are known as inert gases or inert elements. The word inert means chemically unreactive. These gases are also known as Noble Gases. Group 18 is also called zero group.
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