Lutetium

Lutetium is a chemical element with the symbol Lu and atomic number 71. It is a silvery white metal which resists corrosion in dry, but not moist, air. It is the last element in the lanthanide series, and traditionally counted among the rare earths.
Symbol: Lu
Electron configuration: Xe 4f14 5d1 6s2
Discovered: 1907
Melting point: 1,663 °C
Atomic number: 71
Atomic mass: 174.967 ± 0.001 u