ruthenium(redirected from Element 44)
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n. Symbol Ru
A hard silver-white 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 2,334°C; boiling point 4,150°C; specific gravity 12.1 (20°C); valence 0, 1, 2, 3, 4, 5, 6, 7, 8. See Periodic Table.
[From Medieval Latin Ruthenia, Russia, from Ruthenī, Russians, from Russian Rusin, from Old Russian Rusĭ, Russian; see Russian.]
(Elements & Compounds) a hard brittle white element of the platinum metal group. It occurs free with other platinum metals in pentlandite and other ores and is used to harden platinum and palladium. Symbol: Ru; atomic no: 44; atomic wt: 101.07; valency: 0–8; relative density: 12.41; melting pt: 2334°C; boiling pt: 4150°C
[C19: from Medieval Latin Ruthenia Russia, where it was first discovered]
ru•the•ni•um(ruˈθi ni əm, -ˈθin yəm)
a steel-gray, rare metallic element, belonging to the platinum group of metals. Symbol: Ru; at. wt.: 101.07; at. no.: 44; sp. gr.: 12.2 at 20°C.
Symbol Ru A rare, silvery-gray metallic element that is hard, brittle, and very resistant to corrosion. It is used to harden alloys of platinum and palladium for jewelry and electrical contacts. Atomic number 44. See Periodic Table.
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|Noun||1.||ruthenium - a rare polyvalent metallic element of the platinum group; it is found associated with platinum|