Question

why He,Ne and Ar do not have a valency ?​

Answer 1

Answer:

Helium has two electrons in its only energy shell. ... As the elements have the maximum number of electrons in their valence shells (thereby achieving stable duplet and octet configurations), they do not have any tendency to combine with other elements. Hence, Helium, Neon, and Argon have zero valency.

Answer 2

Answer:

Explanation:

All of these are noble gases and are very inert in nature and rarely makes any compounds , hence they do not have a valency