ruthenium

ru·the·ni·um

R0358100 (ro͞o-thē′nē-əm)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.]

ruthenium

(ruːˈθiːnɪəm) n (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)

n. 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. [1840–50; < New Latin, after Ruthenia (where it was first found in ore); see -ium²]

ru·the·ni·um

(ro͞o-thē′nē-əm) 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.

Thesaurus

Noun

ruthenium - a rare polyvalent metallic element of the platinum group; it is found associated with platinumatomic number 44, Rumetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

Translations

ruthenium

enUK

ruthenium

(ro͞othē`nēəm), metallic chemical element; symbol Ru; at. no. 44; at. wt. 101.07; m.p. about 2,310&degC;; b.p. about 3,900&degC;; sp. gr. 12.41 at 20&degC;; valence commonly +2, +3, +4, +6, or +8. Ruthenium is a hard, lustrous, silver-gray metal with a close-packed hexagonal crystalline structure. It is found directly above osmium in Group 8 of the periodic tableperiodic table,
chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled
..... Click the link for more information. . Below about 100&degC; ruthenium is insoluble in acids, including aqua regia, but reacts violently if potassium chlorate is added. It reacts with the halogens and with fused alkali hydroxides. When heated above 800&degC; it oxidizes, but it does not react with air at room temperature. It forms compounds with silicon and sulfur. Its compounds resemble those of osmium. Ruthenium is found in nature with other metals of the so-called platinum group in river sands, in minerals such as laurite (the sulfide) and osmiridium, and in association with certain ores containing platinum, copper, and nickel. It is obtained commercially as a byproduct of the refining of nickel sulfide ores mined near Sudbury, Ont., Canada. Ruthenium metal powder is obtained as the final product of a complex chemical process. It is used as a catalyst in hydrogenation, isomerization, nitrogenation, oxidation, and reforming reactions. The metal is used as a hardener in electrical contact alloys and filaments, in jewelry, in pen nibs, and in instrument pivots. It is usually alloyed with other metals. It is a very good hardener for palladium and platinum, and vastly improves the corrosion resistance of titanium when added in small amounts. It is also used in alloys with cobalt, molybdenum, nickel, tungsten, and other metals. Ruthenium compounds are used to color ceramics and glass. Ruthenium was discovered in 1827 in an impure form by G. W. Osann in residues of crude platinum ores from the Ural Mts. of Russia. Pure ruthenium was first prepared by K. K. Klaus in 1845; he showed that Osann's sample contained at least one other metal.

ruthenium

[rü′thē·nē·əm] (chemistry) A chemical element, symbol Ru, atomic number 44, atomic weight 101.07. (metallurgy) A hard, brittle, grayish-white metal used as a catalyst; workable only at high temperatures.

ruthenium

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

ruthenium

[roo-the´ne-um] a chemical element, atomic number 44, atomic weight 101.07, symbol Ru. (See Appendix 6.)

ru·the·ni·um (Ru),

(rū-thē'nē-ŭm), A metallic element of the platinum group; atomic no. 44, atomic wt. 101.07; ¹⁰⁶Ru, with a half-life of 1.020 years, has been used in the treatment of certain eye problems. [Mediev. L. Ruthenia, Russia, where first obtained]

ru·the·ni·um

(rū-thē'nē-ŭm) A metallic element of the platinum group; atomic no. 44, atomic wt. 101.07; ¹⁰⁶Ru, with a half-life of 1.020 years, has been used in the treatment of certain eye problems. [Mediev. L. Ruthenia, Russia, where first obtained]

ruthenium

ru·the·ni·um

ruthenium

ru•the•ni•um

ru·the·ni·um

ruthenium

ruthenium

ruthenium

ruthenium

ruthenium

ruthenium

ru·the·ni·um (Ru),

ru·the·ni·um

ruthenium

Synonyms for ruthenium

noun a rare polyvalent metallic element of the platinum group

Synonyms

Related Words