Rhenium is a chemical element with 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 estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the crust. Rhenium has the third-highest melting point.

Atomic Weight:  1212
Density:        5355 g/cm3
Melting Point:  34.86 °C
 Boiling Point: 232 °C