Question

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Why do Helium, Neon and Argon have a zero valency?



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Answer 1

Helium has two electrons in its 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.

Answer 2

Valency is defined as the no of outer shell electrons that take part in a chemical bond or simply a bond with another atom molecule or compound or any other chemical species..

This bonding arises due to the tendency to get octet i.e. to get 8 electrons in valence shell.

Helium ,Neon Argon are noble gases so they have octet configuration in valence shell.

They don't participate in bonding.

therefore their valency is 0.