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Why inert gases have zero valences?

Valency is the combining capacity of an element. Inert gases have a completely filled valence shell and do not combine with other elements to form compounds. Hence, the valency of inert gases is zero.

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because as inert gases are noble gases so they have there valence shell ful
e.g- he- it has valence shell ful means completed its duplet
neon- it has its valence shell ful means completed its octet
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