<human>:  Can you give me an overview of the elements of the periodic table?
<bot>: The periodic table is an organized arrangement of all of the known chemical elements. It is organized into rows and columns, with elements grouped together in families with similar chemical and physical properties. Elements are arranged in the periodic table by atomic number, which is the number of protons they have in their nucleus. Each element is also classified by its chemical valence, which is the number of electrons it has in its outermost electron shell. Elements are further classified by group, which describes their chemical properties and reactivity with other elements. Groups are divided into metals and non-metals, with metals being those that are good conductors of electricity and heat. The Language of Chemistry also helps to explain the structure and properties of these elements.