Figure 19-1 shows the three kinds of matter that we all learned about in high school chemistry class: elements (here Chemical Elements), compounds (here Chemical Compounds), and mixtures (here Chemical Formulations).[(]
Figure 19-1: Chemicals
Chemical Elements are the basic substances that everything else is made up of. A quantity of a Chemical Element consists of identical atoms, each consisting of a nucleus consisting of protons and neutrons, plus a number of electrons orbiting the nucleus. This is the simplified explanation. The reality is vastly more subtle and complex than this, but this is enough knowledge of atomic physics ...