Transition metal, atomic number 75.
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 Earth's crust.
Symbol Re. Atomic mass 186.2071 u. Group 7, period 6. Electron configuration [Xe] 4f14 5d5 6s2. Electrons per shell 2, 8, 18, 32, 13, 2. State at room temperature: Solid. Melting point 3185.8 °C, boiling point 5595.9 °C. Discovered by Masataka Ogawa.
Element data from Wikipedia, CC BY-SA 3.0.