What are the maximum and minimum oxidation numbers of N, S and Cl ?

Explanation

(i)The highest oxidation number (O.N) of N is +5 since it has five electrons in the valence shell `(3 S^(2) 3 P^(4))` and its minimum O.N is -2 since it needs two more electons to acquire the nearest inert gas (Ar) configuration
(iii) Likeswise the maximum O.N of CI is +7 since it has seven electrons in the valece shell `(3 S^(2) 3 P^(5))` and its minimum O.N is -1 since it needs only one more electron to acquire the nearest (Ar) gas configuration