Question

Why do the elements helium ,neon and argon have zero valency?

Answer 1

Explanation:

Because they have their octate completed

Answer 2

Answer:

Helium has two electrons in its only energy shell while Argon and Neon have 8 electrons in their valence shells. As these have maximum number of electrons in their valence shells they do not have any tendency to combine with other elements. Hence they have a valency equal to zero.

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