Hafnium

Hafnium
Properties
Atomic symbol	Hf
Atomic number	72
Classification	Transition Metals
Atomic mass	178.49 amu
Other Information
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.