Discovered in 1886 by Clemens Winkler, this element is used in  glass in infrared optical devices, its oxide has been used in  medicine, and its dioxide is used to produce glass with a high  index of 
Discovered in 1886 by Clemens Winkler, this element is used in  glass in infrared optical devices, its oxide has been used in  medicine, and its dioxide is used to produce glass with a high  index of refraction. Its conductivity is intermediate between  metals and nonmetals, but can be improved by adding trace amounts  of arsenic or indium. FTP, name this element, predicted by  Mendeleyev in 1871 and called by him ekasilicon, an important  semiconductor.
Discovered in 1886 by Clemens Winkler, this element is used in  glass in infrared optical devices, its oxide has been used in  medicine, and its dioxide is used to produce glass with a high  index of refraction.
{germanium}