Question

if the atomic no. of an element is 18 so find out the valency

Answer 1

Valency is Zero as argon is the element and its atomic no.is 18 and ya it's a inert gas so its octet is complete so it's valency is 0.

Hope it helps!!

Answer 2

It will be a noble gas as its last shell is completely filled and hence its valency will be zero