A-Level CAIE Chemistry AS 9.2.2—The variation in the oxidation number Question Bank

• State/explain: the variation in the oxidation number of the oxides (Na2O, MgO, Al2O3, P4O10, SO2 and SO3 only) and chlorides (NaCl, MgCl2, Al Cl 3, SiCl4, PCl5 only) in terms of their outer shell (valence) electrons