Why does Argon have a zero valency?

brainliest for the right answer

If you asking about the neon and argon thing then I'll answer it tho!

Neon and Argon's are fully filled electron's in their 1 st shell or most likely it's outermost shell which have 8 electron's in total and it cannot take or loose any of them and it can't even share it tho to anyone and that's why  argon have a zero valency

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.