Question

differentiate between inert gas and normal gas​

Answer 1

inert gases are noble gases, they have 2 or 8 electrons in their outermost shell i.e their octet or duplet is complete so they're stable and don't react with other elements.

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I hope my answer is sufficient enough! ^_^

Answer 2

The noble gases are in Group 18 (8A). They are helium, neon, argon, krypton, xenon, and radon. They were once called inert gases because they were thought to be completely inert—unable to form compounds. ... Noble gases all have a complete octet (eight valence electrons), except for helium (which has only two electrons).