Question

(a) How many electrons do inert gases have in their valence shells?

(b) Name an element of group 18 which can form compounds.

Answer 1

a) - They are completely filled with valence shell, $n{s}^{2}n{p}^6$ that is equal to 8 valence in their outermost shell. Therefore, they are very unreactive. These elements are called as Noble gas elements or Zero group elements.

b) Xenon (Xe).