ocr: Rule Examples Molecules containing only one element have an oxidation number Ti, 0 of 0. S8, 0 Simple ions (ions of one atom) have an oxidation number equal to Zn2+,+2 the charge on the ion. Br, -1 All alkali metals (Group IA or 1) have an oxidation number of 1; Li, +1 all alkaline earth metals (Group IIA or 2) have an oxidation Mg, +2 number of 2.Aluminum is always 3. Fluorine is always -1. Al, +3 Oxygen has an oxidation number of -2, except in peroxides where OinC Ca0, -2 itis -1 and where it is in combination with more electronegative Oin H202, -1 elements like F, where it accommodates riuo ...
