D012428Level 5
Ruthenium
**Definition:** 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.
**Tree numbers:** - D01.268.556.805 - D01.268.956.812 - D01.552.544.805
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