Question

The elements of group 18 are called zero valent. Give reason.​

Answer 1

Explanation:

Elements of group 18 have their outermost shell completely filled. So, they neither gain electron nor lose any electron and hence have zero valency. Thus, they are called zero valent.

Answer 2

Answer:

Group 18 elements have their outermost shells completely filled and the atoms of these elements have no tendency to gain or lose electrons. Thus, the elements of this group are zero valent and almost unreactive.