Rhenium: Last Naturally Occurring Stable Precious Metal Discovered
April 27th, 2010 by hendri 
No Comments In the periodic table of elements, rhenium is found as a third-row transition metal in group 7. Known to be one of the rarest precious metals in the Earth’s crust, rhenium has an average concentration of 1 part per billion. It is obtained mainly as a by-product of the refinement of two other chemical elements – copper and molybdenum.
Rhenium was discovered as a trace element in the mineral columbite and in platinum ores. Three German chemists – Otto Berg and [...]
