Hafnium

Hafnium ek chemical element hae, jiske chemical symbol Hf, atomic number 72 aur atomic mass 178.49 hae. II ek badalte dhaatu hae. 1869 me Dmitri Mendeleev batais rahaa ki ii element hae lekin iske khaali 1922, me Dirk Coster aurGeorge de Hevesypaae rahin"Two Danes Discover New Element, HafniumDetect It by Means of Spectrum Analysis of Ore Containing Zirconium", The New York Times, January 20, 1923, p. 4 

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