What are the characteristics of rhenium and osmium?

               Rhenium is a tough metal. It is silvery grey in colour, and  very heavy.

               Three German chemists, Walter Noddack, Ida Tacke, and Otto Berg are credited with the discovery and naming of the element in 1925.

               They reported that they had detected the element in platinum ore and in the mineral columbite. They also found rhenium in gadolinite and molybdenite. The trio named the element after the Rhine River in Germany.

               Rhenium has the highest boiling point of any of the elements. The single most common commercial use for rhenium is in the alloys that make up jet engines. Rhenium has the atomic number 75, and its atomic symbol is Re.

 

 

 

 

                Osmium is a hard and brittle metal, in bluish white colour. The name comes from the Greek word osme, which means smell, scent or odour. British chemist Smithson Tennant discovered osmium in 1803. The atomic number of osmium is 76, and its atomic symbol is Os.

 

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