Rhenium

86
Re
186.207

rhenium.jpg (2094 bytes)
Rhenium is used in oven for filament.

Properties

Symbol Name Atomic Number Atomic Weight Group Number
Re Rhenium 86 186.207 7

Description

Standard State: solid at 298 K
Color: grayish white

Discovery of Rhenium is generally attributed to Noddack, Tacke, and Berg, who announced in 1925 they detected the element in platinum ores and columbite. They also found the element in gadolinite and molybdenite. Rhenium does not occur free in nature or as a compound in a distinct mineral species.   It is, however, widely spread throughout the earth's crust to the extent of .001 ppm.  Commercial rhenium is the U.S. today is obtained from molybdenite roaster-flue dusts obtained from copper-sulfide ores mined in the vicinity of Miami, Arizona, and Utah. Rhenium is used as an additive to tungsten and molybdenum-based alloys to impart useful properties.   It is widely used for mass spectrographs and ion gages.