Basic Information

Name: Lutetium 
Symbol: Lu 
Atomic Number: 71 
Atomic Mass: 174.967 amu 
Melting Point: 1656.0 °C (1929.15 K, 3012.8 °F) 
Boiling Point: 3315.0 °C (3588.15 K, 5999.0 °F) 
Number of Protons/Electrons: 71 
Number of Neutrons: 104 
Classification: Rare Earth 
Crystal Structure: Hexagonal 
Density @ 293 K: 9.85 g/cm3 
Color: silvery
Date of Discovery: 1907 
Discoverer: Georges Urbain 
Name Origin: From Lutetia (ancient name of Paris) 
Uses: No uses known 
Obtained From: gadolinite, xenotime