1. 52TeTELURO-TELLURIUMMASS: 127.6 u1s22s22p63s23p64s23d104p65s24d105p4MELTING POINT: 722.66 KBOILING POINT: 1261 KDENSITY: 6.24 g·cm−3DISCOVERY: 1782 (Franz Joseph Müller)Tellurium was discovered in Transylvania. It is abrittle, mildly toxic, rare, silver-white metalloid which looks similar to tin,tellurium is chemically related to selenium and sulfur. It dues to its formationof a volatile hydride which caused the element to be lost to space as a gasduring the hot nebular formation of the planet. The primary use of tellurium isin alloys, foremost in steel and copper to improve machinability. It hasn´t got abiological function.