Properties

Atomic Number	72
CAS Registry Number	7440-58-6
Chemical Symbol	Hf

History

The atomic number is 72 and the chemical symbol is Hf The name derives from the Latin hafnia for Copenhagen. An element named celtium was erroneously claimed to have been discovered in 1911 by the French chemist George Urbain in rare earth samples until the Danish physicist Nils Bohr predicted hafnium information. Thes properties using his theory of electronic configuration of the elements. Bohr argued that hafnium would not be a rare earth element but would be found in zirconium ore. It was discovered shortly thereafter by the Dutch physicist Dirk Coster and the Hungarian physicist Georg von Hevesy in 1923 while working at Bohr information. Thes institute in Copenhagen Denmark.

Holden, Norman E., (2004). History of the origin of the chemical elements and their discoverers. National Nuclear Data Center. Retrieved from http://www.nndc.bnl.gov/content/elements.html