Hafnium is a silvery metal element with the symbolHf occurring in zircon and used in nuclear reactors in the control rods and also used for light-bulb filaments. It was named in 1923 by the Dutch physicist Dirk Coster and Hungarian chemist Georg von Hevesy after the city of Copenhagen, where the element was discovered (Hafnia is Latin for Copenhagen). Research Hafnium
 
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert