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2005-05-26 10:45:58

Hafnium is a chemical element in the periodic table that has the symbol Hf and atomic number 72. A lustrous, silvery gray tetravalent transition metal, hafnium resembles zirconium chemically and is found in zirconium minerals. Hafnium is used in tungsten alloys in filaments and electrodes and also acts as a neutron absorber in nuclear control rods. Notable characteristics This is a shiny silvery, ductile metal that is corrosion resistant and chemically similar to zirconium. The...

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  • A coin originally worth six pennies Scots, and later three; held equivalent to an English halfpenny.
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