Element 75 is known as rhenium, a rare metal that belongs to the transition metals group in the periodic table. It has the chemical symbol Re and is characterized by its high melting point and excellent resistance to corrosion. Rhenium is primarily used in high-temperature superalloys, which are essential for jet engines and other aerospace applications. Discovered in 1925 by Walter Noddack, Ida Tacke, and Otto Berg, rhenium is one of the least abundant elements in the Earth's crust. It is often obtained as a byproduct of molybdenum and copper mining. Rhenium also plays a role in catalysts for petroleum refining, enhancing the efficiency of fuel production.