Rhenium

Chemical Formula: Re
Atomic Number: 75
Atomic Weight: 186.207
Category: Transition Metal

Although its existence was predicted years earlier, Rhenium was not officially ‘discovered’ until 1928. Rhenium is one of the most rare elements in the earth’s crust and is primarily extracted from the mineral molybdenite, where it occurs in amounts up to 0.2%. Total annual world production of Rhenium is about 40 to 50 tonnes, which primarily comes from Chile, the United States and Kazakhstan.