A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum.
A white metallic element of the platinum group, used mainly as a hardener for platinum or palladium. Melting point above 2400ยบ C; specific gravity 12.2.
Ruthenium (abbreviated Ruth or Ru) is a precious metal that belongs to the platinum group of metals. In jewelry, ruthenium is added to platinum alloys; about 5 to 10 perent ruthenium can be added to platinum to harden and strengthen the alloy. Ruthenium's atomic number is 44.
Ruthenium (IPA: ) is a chemical element in the periodic table that has the symbol Ru and atomic number 44. A rare transition metal of the platinum group, ruthenium is found associated with platinum ores and used as a catalyst in some platinum alloys.
Two ruthenium isotopes are by-products of plutonium production. Virtually nothing is known about the effects of these radionuclides on body systems except contact with skin cause burns. These isotopes were produced at Hanford, Washington.