![]() ![]() Several elements have invariable oxidation numbers in their common compounds. in CO32- C = +4 and O = -2 oxidation numbers of the elements adds up to the charge sum = +4 + (3 x -2) = -2 on the ion 5. In a polyatomic ion (CO32-) the sum of the individual e.g. The oxidation number of a monoatomic ion is equal to the e.g. The oxidation numbers of the elements in a compound add In NaCl Na= +1 Cl= -1 up to zero Sum = +1 -1 = 0 3. All uncombined elements have an oxidation number of zero 2. ![]() Zn, Cl2, O2, Ar all have oxidation numbers of zero 1. Redox oxidation is the process of electron loss: reduction is the process of electron gain: Zn Zn2+ + 2e- Cl2 + 2e- 2Cl- It involves an increase in oxidation number It involves a decrease in oxidation number Rules for assigning oxidation numbers eg. ![]()
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