A periodic table clock. Final episode in our 12 Days of Christmas, each featuring chemistry gifts received by Sir Martyn during the year. All the videos in this series appear here as they're released: http://bit.ly/12_Days_Xmas All 118 elements: http://bit.ly/118elements More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos From the School of Chemistry at The University of Nottingham: http://bit.ly/NottChem Periodic Videos films are by video journalist Brady Haran: http://www.bradyharan.com/ Brady's Blog: http://www.bradyharanblog.com/ Join Brady's mailing list for updates and extra stuff --- http://eepurl.com/YdjL9