So, a redox reaction did take place. Now, a reducing agent is simply a compound that contains an element that donates electrons, hence it reduces another So, in your case, you know that hydrogen is being oxidized in this reaction, which means that it's donating electrons. This implies that it is acting...5. Following the name of the metal, the oxidation state of the metal in the complex is given as a Roman numeral in parentheses. C. To name a neutral complex molecule, follow the rules of naming a complex cation. Examples Give the systematic names for the following coordination compoundsThe majority of the lines slope upwards, because both the metal and the oxide are present as condensed phases (solid or liquid). The position of the line for a given reaction on the Ellingham diagram shows the stability of the oxide as a function of temperature.