Erbium is a chemical element with the symbol **Er** and atomic number **68**. It belongs to the lanthanide series of the periodic table, which is composed of a group of 15 elements often referred to as rare earth elements. Erbium is a silvery-white metal and is notable for its relatively high thermal stability and resistance to corrosion.
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Erbium is the chemical element with atomic number 68 and symbol . It is a lanthanide. Erbium ions in glass can absorb and emit infrared light near telecommunications wavelengths. Erbium-doped optical amplifiers exploit these electronic transitions, linking an element's energy levels to long-distance optical communication.[ref]