Ruthenium
A hard, brittle, grayish-white rare earth metal with an atomic symbol Ru, atomic number 44, and atomic weight 101.07. It is used as a catalyst and hardener for PLATINUM and PALLADIUM.
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Subheadings:
Tree Number(s): D01.268.556.805, D01.268.956.812, D01.552.544.805
MeSH Unique ID: D012428
Registry Number: 7UI0TKC3U5