Rhenium (Latin Rhenus meaning Rhine) was the next-to-last naturally occurring element to be discovered and the last element to be discovered having a stable isotope. The existence of a yet undiscovered element at this position in the periodic table had been predicted by Henry Moseley in 1914. It is generally considered to have been discovered by Walter Noddack, Ida Tacke, and Otto Berg in Germany. In 1925 they reported that they detected the element in platinum ore and in the mineral columbite. They also found rhenium in gadolinite and molybdenite. In 1928 they were able to extract 1 g of the element by processing 660 kg of molybdenite. The process was so complicated and expensive that production was discontinued until early 1950 when tungsten-rhenium and molybdenum-rhenium alloys were prepared. These alloys found important applications in industry that resulted in a great demand for the rhenium produced from the molybdenite fraction of porphyry copper ores.
In 1908, Japanese chemist Masataka Ogawa announced that he discovered the 43rd element and named it nipponium (Np) after Japan (which is Nippon in Japanese). However, later analysis indicated the presence of rhenium (element 75), not element 43.The symbol Np was later used for the element neptunium.

Rhenium is an metal with the formula Re, and its systematic name is the same with the product name. With the CAS registry number 7440-15-5, it is also named as Rhenium, elementar. It belongs to the product categories of Inorganics; Metal and Ceramic Science; Metals; Rhenium; Alternative Energy; Catalysis and Inorganic Chemistry; Fuel Cell Catalysts Chemical Synthesis; Materials Science; Metal or element. Its EINECS number is 231-124-5. In addition, the molecular weight is 186.21. This chemical should be sealed and stored in a cool, ventilated and dry place. Rhenium is a silvery-white metal with one of the highest melting points of all elements, exceeded by only tungsten and carbon. It is also one of the densest, exceeded only by platinum, iridium and osmium. Rhenium has a hexagonal close-packed crystal structure.

Preparation: commercial rhenium is extracted from molybdenum roaster-flue gas obtained from copper-sulfide ores. Some molybdenum ores contain 0.001% to 0.2% rhenium. Rhenium(VII) oxide and perrhenic acid readily dissolve in water; they are leached from flue dusts and gasses and extracted by precipitating with potassium or ammonium chloride as the perrhenate salts, and purified by recrystallization. Recycling of used Pt-Re catalyst and special alloys allow the recovery of another 10 tons per year.The metal form is prepared by reducing ammonium perrhenate with hydrogen at high temperatures.

2 NH₄ReO₄ + 7 H₂ → 2 Re + 8 H₂O + 2 NH₃

Uses of Rhenium: it is added to high-temperature superalloys that are used to make jet engine parts, making 70% of the worldwide rhenium production. Another major application is in platinum-rhenium catalysts, which are primarily used in making lead-free, high-octane gasoline.

When you are using this chemical, please be cautious about it as the following:
This chemical is highly flammable, so you should keep it away from sources of ignition - No smoking. It can cause burns. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. You need to take off immediately all contaminated clothing. You must take precautionary measures against static discharges. When using it, you need to wear suitable protective clothing and avoid contact with skin and eyes. In case of accident or if you feel unwell, you should seek medical advice immediately (show the label where possible).

You can still convert the following datas into molecular structure:
(1)SMILES: [Re]
(2)Std. InChI: InChI=1S/Re
(3)Std. InChIKey: WUAPFZMCVAUBPE-UHFFFAOYSA-N

The toxicity data is as follows: