Hafnium
element with the atomic number of 72
Hafnium is a chemical element. It has the chemical symbol Hf. It has the atomic number 72. It is a metal. It is silver gray. In chemistry it is placed in a group of metal elements named the transition metals. The chemistry of hafnium is similar to zirconium.
![](http://up.wiki.x.io/wikipedia/commons/thumb/3/38/Hf-crystal_bar.jpg/220px-Hf-crystal_bar.jpg)
Hafnium is found in zirconium minerals.
Hafnium is used in tungsten alloys in filaments and electrodes. It is also used as a neutron absorber in control rods in nuclear power plants.
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