Lutetium (Lu) is a chemical element with atomic number (Z) 71, group n/a, period 6, and atomic weight 174.967. The Lutetium (Lu) is a silvery white metal, which resists corrosion that is the hardest and the densest of the lanthanides, used as a pure beta emitter, using lutetium which has been exposed to neutron activation. (Refer to the Chemical Element; Periodic Table)
