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

(i) The highest oxidation number (O.N.) of N is +5 since it has five electrons in the valence shell $(2\,{{s}^{2}}\,2\,{{p}^{3}})$and its minimum O.N. is -3 since it can accept three more electrons to acquire the nearest inert gas (Ne) configuration. (ii) Similarly, the highest O.N. of S is +6 since it has six electrons in the valence shell $(3\,{{s}^{2}}3\,{{p}^{4}})$ and its minimum O.N. is -2 since it needs two more electrons to acquire the nearest inert gas $(Ar)$ configuration. (iii) Likewise the maximum O.N. of $Cl$ is +7 since it has seven electrons in the valence 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.