Date of Discovery: 1923
Discoverer: Dirk Coster
Name Origin: From the Latin word Hafnia (Copenhagen)
Uses: nuclear reactors
Obtained From: zircon

 
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)
Crystal Structure: Hexagonal
Density @ 293 K: 13.2 g/cm3
Color: Silver

 
Isotope
Hf-172
Hf-174
Hf-175
Hf-176
Hf-177
Hf-179
Hf-180
Hf-182
Half Life
1.9 years
2.0E15 years
70.0 days
Stable
Stable
Stable
Stable
Stable