Question

why insert gases have zero valency​

Answer 1

Explanation:

Inert gases have very high ionisation enthalpy because they have stable electronic configuration. Therefore they have no tendency to loss electrons. Thus the valency of inert gases are zero.

Answer 2

Inert gases have very high ionisation enthalpy because they have stable electronic configuration. Therefore they have no tendency to loss electrons. Thus the valency of inert gases are zero