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Rhenium is a chemical element; it has symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table.
Rheniite is a very rare rhenium sulfide mineral with the chemical formula (ReS 2). It forms metallic, silver grey platey crystals in the triclinic - pinacoidal class. [2] It has a specific gravity of 7.5. It was discovered at the Kudriavy Volcano, Iturup Island in the Kurile Islands, Russia and approved in 2004. [4]
Naturally occurring rhenium (75 Re) is 37.4% 185 Re, which is stable (although it is predicted to decay), and 62.6% 187 Re, which is unstable but has a very long half-life (4.12×10 10 years). [4] Among elements with a known stable isotope, only indium and tellurium similarly occur with a stable isotope in lower abundance than the long-lived ...
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Rhenium(VII) oxide can be formed when rhenium or its oxides or sulfides are oxidized a 500-700 °C in air. [24] It dissolves in water to give perrhenic acid. Heating Re 2 O 7 gives rhenium(IV) oxide, signalled by the appearance of the dark blue coloration. [25] In its solid form, Re 2 O 7 consists of alternating octahedral and tetrahedral Re ...
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Rhenium(VI) oxide has an appearance similar to that of copper. Rhenium(IV) oxide (or rhenium dioxide) is an oxide of rhenium, with the formula ReO 2. This gray to black crystalline solid is a laboratory reagent that can be used as a catalyst. It adopts the rutile structure. It forms via comproportionation: [4] 2 Re 2 O 7 + 3 Re → 7 ReO 2