Hafnium

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Hafnium
Name Hafnium
Symbol Hf
Atomic number 72
Atomic mass 178.49 amu
Normal state Solid
Classification Transition Metals
Crystal structure Hexagonal
Color Silver
Date of discovery 1923
Name of discoverer Dirk Coster & Georg von Hevesy
Name origin From the Latin name for Copenhagen, Hafnia.
Uses Due to its ability to absorb neutrons, used in reactor control rods and also as a gas scavenger in vacuum tubes.
Obtained from Obtained as a by-product of zirconium refining.
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