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n. A hard silver-gray acid-resistant metallic element that is found in platinum ores and is used to harden platinum and palladium for jewelry and in alloys for nonmagnetic wear-resistant instrument pivots and electrical contacts. Atomic number 44; atomic weight 101.07; melting point 2,310°C; boiling point 3,900°C; specific gravity 12.41; valence 0, 1, 2, 3, 4, 5, 6, 7, 8. See Table at element.

n. a metallic chemical element (symbol Ru) with an atomic number of 44.

n. 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.

n. Chemical symbol, Ru; atomic weight, 103.5 (Claus). A metal of the platinum group.

n. a rare polyvalent metallic element of the platinum group; it is found associated with platinum

"Electro-deposition using black rhodium or ruthenium is the first technique."

metallic element    metal   

platinum   

iridium    subgroup    andaluminum    chromite    dolman    thorium    enantioselective    course-a    niobium    zeolite