text: The Periodic Table of Videos has filmed at least one video for each of the 118 elements (from hydrogen to oganesson). They have also filmed several videos that discuss molecules such as DO (heavy water) and sulfuric acid. Also filmed are "Chem definitions" that provide an explanation to words that are used in chemistry. Lastly, the team has filmed "Roadtrips" where they travel to different places in the world that have an importance in chemistry (such as the mine outside Ytterby, Sweden, which had four elements – yttrium, terbium, erbium, and ytterbium – named after it.)