Rhenium was the last stable element to be discovered. It was named after the river Rhine in Europe. Rhenium is a silvery-white metal with one of the highest melting points of all elements, exceeded by only tungsten and carbon.
R 0096 (OTTO) Rhenium powder, -200 mesh, 99.95% Cas 7440-15-5 - used as filaments in mass spectrographs and in ion gauges.