Question

why inert gas elements placed in group 0 ?​

Answer 1

Answer:

Inert gases have their completely filled valence shell with octet of electrons. So they have 0 valency and thus non reactive in nature thus placed in Zero Group.

Explanation:

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Answer 2

Answer:

The noble gases (historically also the inert gases; sometimes referred to as aerogens) make up a class of chemical elements with similar properties; under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity. The six naturally occurring noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).

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