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Rhenium - Wikipedia. Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-gray heavy third-row transition metal in group 7 of the periodic table.With an estimated average concentration of 1 part per billion ppb rhenium is one of the rarest elements in the Earths crust.Rhenium has the third-highest melting point and second-highest boiling point of any