a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal.
The name hafnium comes from the Latin word Hafnia, which means Copenhagen, combined with the suffix -ium. It was named after the city where the element was discovered.