Rhenium Price Rhenium is a chemical element with the element symbol Re and the atomic number 75. In the periodic table of the elements it is in the 7th subgroup (group 7) or manganese group. It is a very rare, silver-white, shiny, heavy transition metal. Alloys with rhenium components are used in aircraft engines, in the manufacture of unleaded gasoline and in thermocouples. Biological functions of rhenium are not known, it does not normally occur in the human organism. Likewise, no toxic effects of the metal are known, [...]