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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 control rods in nuclear power plants.

Note:   The above text is excerpted from the Wikipedia article "Hafnium", which has been released under the GNU Free Documentation License.
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