SciShow
Rare Earth Elements
Hank reveals why our love affair with the rare earth elements has a dark side.
Professor Dave Explains
Periodic Table Part 10: Transition Metals, Lanthanides and Actinides
With the main-group elements covered, it's time to check out the other sections of the periodic table, those being the transition metals, as well as the lanthanides and actinides. We rarely discuss most of these elements, so what are...