From Periodic Videos. A new and improved video about Thulium. More links and info in full description ↓↓↓ Support Periodic Videos on Patreon (and appear on our table): https://www.patreon.com/periodicvideos Videos on all 118 elements: http://bit.ly/118elements Cleve on the discovery of Thulium: https://babel.hathitrust.org/cgi/pt?id=umn.31951d00008409h&view=1up&seq=714 Thulium I paper by C.James (with the 15,000 crystallisations): https://pubs.acs.org/doi/10.1021/ja02221a007 Thanks to Anthony…