Why do helium, neon and argon have a zero valency?
 

Answers (1)

Answer:

Noble gases have full filled octet, i.e., the subshell are completely filled. They have the general electronic configuration as ns^{2}np^{6}

Valency is a combining capacity of an element. As there are no free electrons in the valence shell as well as the elements are already in a stable state, so the valency of the noble gases is zero.

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