Answer
Hafnium, a chemical element with the symbol Hf and atomic number 72, was co-discovered by George de Hevesy in 1923. Hevesy, a Hungarian chemist, made the discovery while working with Dirk Coster, a Dutch physicist, at the Niels Bohr Institute in Copenhagen. The element was named after Hafnia, the Latin name for Copenhagen. Hafnium is a transition metal that is silvery-white in color and has a high melting point.