Symbol Re
Atomic Number 75
Atomic Mass 186.23 g.mol -1
Discovered by Walter Noddack, Ida Tacke and Otto Berg in 1925

Chemical Properties of Rhenium

Group 7 Melting point 3185°C, 5765°F, 3458 K
Period 6 Boiling point 5590°C, 10094°F, 5863 K
Block d Density (g cm−3) 20.8
Atomic number 75 Relative atomic mass 186.207
State at 20°C Solid Key isotopes 187Re
Electron configuration [Xe]4f14 5d6s2 CAS number 7440-15-5
ChemSpider ID 22388 ChemSpider is a free chemical structure database

What is Rhenium?

  • Rhenium is an extremely rare element and is scattered widely in nature.
  • It is a heavy, silvery-white and a third-row transition metal in group 7 of the periodic table.
  • The element can be traced on the earth’s surface in parts per billion.
  • The element has no mineral characteristic and it has been detected in certain ores of platinum and molybdenite.

Uses of Rhenium

  • The element is mainly used as a petroleum reforming catalyst and also in turbine engine of high-temperature components as superalloys.
  • The element amplifies the high-temperature strength properties of some nickel-based superalloys.
  • Rhenium is added to molybdenum and tungsten to form alloys that are used for making filaments for lamps and ovens.
  • Rhenium is added to high-temperature superalloys which are used to make jet engine parts.

Properties of Rhenium

  • The element has a very high melting point next to Tungsten.
  • The element is formed using oxidizing smelter residues gained by molybdenite processing.
  • The atmospheric heat would be more than sufficient to form the metallic version of this element.

Facts About Rhenium

  • The element is an important part of photoflash in photography.
  • It is used in the hydrogenation of fine chemicals and also as an additive to molybdenum and tungsten based alloys.

Practise This Question

0.1 mol of methyl amine (Kb = 5 × 104) is mixed with 0.08 mol of HCl and the solution is diluted to 1 litre. The hydrogen ion concentration of the resulting solution is: