Home 72 Hf Hafnium back to the periodic table
 
Atomic number   72
Symbol   Hf
Atomic weight   178.49
Density [g/cm3]   13.31
Melting point [°C]   2150
Boiling point [°C]   5400
1st Ionization energy [eV]   7.0
Electronic configuration   [Xe] 4f14 5d2  6s2
Oxidation number (most stable)   4
Atomic radius [pm]   156.4 (a)
Ionic radius [pm]   71 (4+)
Abundance in crustal rocks [ppm]   2.8
Origin of the name   (lat.) Hafnia = Kopenhagen
Discovery   1907 by Urbain and independently by Auer von Welsbach
Uses   no technical significance.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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