Dysprosium is a chemical element with the symbol Dy and atomic number 66. It is a rare earth element with a metallic silver luster. Dysprosium is never found in nature as a free element, though it is found in various minerals, such as xenotime. Naturally occurring dysprosium is composed of 7 isotopes, the most abundant of which is 164Dy.Symbol: Dy
Electron configuration: Xe 4f10 6s2
Discovered: 1886
Melting point: 1,412 °C
Atomic number: 66
Atomic mass: 162.5 ± 0.001 u