Question

What are inert gases? Why are they called so?

Answer 1

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They were once called inert gases because they were thought to be completely inert—unable to form compounds. This is a reasonable belief because the noble gases have a complete octet, making them very stable and unlikely to gain or lose any electrons.

Answer 2

Answer:

inert gases are which doesn't react with other gases.

and they are called so because in the outermost orbit there is valence shell