(a) Identify the element that have two completely filled shells and the number of valence electrons in each are as:
(i) 1 (ii) 2 (iii) 7 (iv) 8
(b) Analyse which amongst them is inert,
(a) The element having 8 valence electrons.
(b) The element which have 8 electrons in its valence shell. It is Neon (2,8).