Hafnium (Hf) Hafnium (Hf) is a chemical element with atomic number (Z) 72, group 4, period 6, and atomic weight 178.49. The Hafnium (Hf) is a lustrous, silvery, ductile metal that resists corrosion due to formation of a tough, impenetrable oxide film on its surface, used for control rods in nuclear reactors and nuclear submarines. (Refer to the Chemical Element; Periodic Table)
