Question

Answer the following questions:-
(2*5=10
1. Why do Helium, Neon and Argon have a zero valency?​

Answer 1

Answer:

Neon and argon have completely filled electrons in their outermost shell with eight electrons and cannot lose, gain or share electrons with atoms of other elements. Therefore, the valency of these gases is zero

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Answer 2

Explanation:

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