Some elements, like iron and lead, have more than one oxidation number. If you were given a compound name like lead chloride, you would not know if you should used an oxidation number of +2 or +4 for the lead. The stock system is used to specify which form of an element, that shows multiple oxidation numbers, is used in a particular compound. CH 4 - Also known by the more common name methane, this carbon and hydrogen based organic compound is a widely recognized waste product of living things. 3. C 55 H 72 O 5 N 4 Mg - Better known among researchers as chlorophyll-a, this component found in green plants not only is high in carbon and hydrogen ratios, but is also a chief factor in the process of photosynthesis in plants.
Sodium Chloride Magnesium Chloride Aluminum Chloride Aluminum Oxide. Na+1 + Cl-1 Mg+2 + Cl-1 Al+3 + Cl-1 Al+3 + O-2. Cross down the charges Cross down the charges Cross down the charges Cross down charges. Na1Cl1 or NaCl Mg1Cl2 or MgCl2 AlCl3 or Al1Cl3 Al2O3.