1 describe, and write equations for, the reactions of the elements with oxygen (to give Na2O, MgO, Al 2O3, P4O10, SO2), chlorine (to give NaCl, MgCl 2, Al Cl 3, SiCl 4, PCl 5) and water (Na and Mg only)
2 state and explain the variation in the oxidation number of the oxides (Na2O, MgO, Al 2O3, P4O10, SO2 and SO3 only) and chlorides (NaCl, MgCl 2, Al Cl 3, SiCl 4, PCl 5 only) in terms of their outer shell (valence shell) electrons
