Ruthenium - Periodic Table of Videos
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The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one element, ruthenium, has a rather special place in the heart of Professor Martyn Poliakoff.
Ruthenium is one of the six platinum group metals (Ru, Os, Rh, Ir, Pd and Pt). It is used in jewelry, as a thin plating that has a darkish grey, pewter-like shine to it.