ticl4 2 mg --> ti 2 mgcl2 (a) use both the rules that you learned and algebraic calculations to determine the oxidation number for each element on the reactants side of this equation, and then for each on the products side. show your calculations. (ti above is titanium.) (b) which element in the starting materials is being oxidized? how do you know? which is being reduced? how do you know?