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.
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.