High Quality Content by WIKIPEDIA articles! Sodium perrhenate (NaReO4) is a white crystalline solid. It is a commonly available precursor for rhenium compounds. Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust. The free element has the third-highest melting point of any element, exceeded only by tungsten and carbon.

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