Lu Lutetium 174.97 Lutetium is one of the rare earth elements on the periodic table. Lutetium is a silvery and white element with an atomic number of 71 and a symbol of Lu. It was discovered in 1907 by two independent investigators.
Nobody knows who discovered it first but they both found it at about the same time.
Lutetium is used to determine the age of meteorites in relation to the earth. This element is found in Gadolinite and xenotime. Lutetium boils at 3315 degrees Celsius and melts at 1656 degrees Celsius. This element is often associated with yttriu m.