We've done all 118 - but our job's not finished. Now we're updating all the videos with new stories, better samples and bigger experiments.
Plus we're making films about other areas of chemistry, latest news and occasional adventures away from the lab.
We've also started a new series - The Molecular Videos - featuring our favourite molecules and compounds.
All these videos are created by video journalist Brady Haran, featuring real working chemists from the University of Nottingham."
For full details go to http://www.periodicvideos.com/index.htm