Basic Information

Name: Hafnium 
Symbol: Hf 
Atomic Number: 72 
Atomic Mass: 178.49 amu 
Melting Point: 2150.0 °C (2423.15 K, 3902.0 °F) 
Boiling Point: 5400.0 °C (5673.15 K, 9752.0 °F) 
Number of Protons/Electrons: 72 
Number of Neutrons: 106 
Classification: Transition Metal 
Crystal Structure: Hexagonal 
Density @ 293 K: 13.2 g/cm3 
Color: Silver
Date of Discovery: 1923 
Discoverer: Dirk Coster 
Name Origin: From the Latin word Hafnia (Copenhagen) 
Uses: nuclear reactors 
Obtained From: zircon