The beginning of the section 4.4 Chem Talk starts out with a basic review of what a metal is and certain characteristics that it possesses. Importantly, the book mentions hows the majority of metals listed on the periodic table are more reactive than hydrogen and are most commonly found in nature in their ionic forms. Next, the talk goes into the activity series, which was a pretty basic and understandable concept. Special reactions can take place between metals and metal ions. For example, rust, or oxidation can take place when a metal is giving up electrons. Hydrogen is included in the activity series because it is a natural reactant with metals, meaning it can quickly establish how reactive another metal is. This talk was pretty easy to grasp and somewhat interesting. Adios.