Rhenium (Re)

Atomic Number75
Atomic Mass186.2071 u
CategoryTransition metal
Electron Config[Xe] 4f¹⁴ 5d⁵ 6s²
Appearancesilvery-grayish
Density (STP)21020 g/L
Melting Point3459 K
Boiling Point5869 K
Electronegativity1.9 (Pauling)
Ionization Energy760 kJ/mol
Atomic Radius135 pm
Crystal StructureSimple Hexagonal
Discovered ByMasataka Ogawa (1925)

Brief Introduction

Rhenium (Re) is a rare, silvery-white, lustrous transition metal, extremely dense, and one of the rarest elements in the Earth's crust. It has the third-highest melting point of all elements and is highly resistant to corrosion. Key details about Rhenium (Re) are as follows:

Uses: Primarily used in high-temperature superalloys for jet engine turbine blades (due to its high melting point and resistance to creep), as electrical contacts, in thermocouples for measuring high temperatures, and in catalysts for petroleum refining.

Production/Extraction: It is extremely rare, with an average crustal abundance of only about 1 part per billion. It is primarily obtained as a byproduct of copper and molybdenum mining, as it occurs in trace amounts in molybdenite ore.

History: Discovered in 1925 by Walter Noddack, Ida Tacke, and Otto Berg in Germany. It was the last element with a stable isotope to be discovered and was named after the Rhine River (Latin: Rhenus) in Germany.

Health Effects & Safety: Rhenium metal is relatively non-toxic, but some of its compounds, particularly perrhenates, can be toxic and irritating. It is not known to accumulate in the body.

Price/Market: One of the rarest and most expensive metals, with prices driven by demand from the aerospace and petroleum industries. Supply is limited and dependent on copper and molybdenum production.

Properties: It has the third-highest melting point of all elements (3186°C), is extremely dense (21.02 g/cm³), and is highly resistant to corrosion and oxidation. It is also one of the most expensive metals by weight.

← Tungsten (W) · Osmium (Os) →

Periodic Table