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Why do Helium, Neon and Argon have a zero valency?
Helium has two electrons in its valence shell. Argon and Neon have 8 electrons each in their valence shells.
As these elements have the maximum number of electrons in their valence shells (stable duplet and octet configurations), hence, they do not have any tendency to combine with other elements.
Therefore, Helium, Neon, and Argon have zero valency.
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