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n. A rare, dense, silvery-white metallic element with a very high melting point used for electrical contacts and with tungsten for high-temperature thermocouples. Atomic number 75; atomic weight 186.2; melting point 3,180°C; boiling point 5,627°C; specific gravity 21.02; valence 1, 2, 3, 4, 5, 6, 7. See Table at element.

n. A metallic chemical element (symbol Re) with an atomic number of 75.

n. a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum

"Sometimes platinum is combined with a second catalyst (bimetallic catalyst) such as rhenium or another noble metal."

metallic element    metal   

wolfram    tantalum    nickel-iron    niobium    strontium