Rhenium
Rhenium was discovered by Walter Noddack, Ida Noddack, and Otto Berg in Germany. In 1925, they reported that they detected the element in a platinum ore and in the mineral columbite. They also found rhenium in gadolinite and molybdenite. In 1928, they were able to remove 1 g of the element from 660 kg of molybdenite.