Notes
Rules For Assigning Oxidation Number…
The oxidation number of an atom can be calculated with the help of the following rules:
(i) The sum of the oxidation numbers of all of the atoms in a neutral compound is 0.
(ii) The oxidation number of a free element is always 0. The atoms in He and N2, for example, have oxidation numbers of 0.
(iii) The convention is that the cation is written first in a formula, followed by the anion. For example, in NaH, the H is H-; in HCl, the H is H+.
(iv) The oxidation number of a Group IA element in a compound is +1.
(v) The oxidation number of a Group IIA element in a compound is +2.
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