hafnium

Definition of hafnium

haf´ni`um   Pronunciation: hăf´nē`ŭm or häf´nē`ŭm
n.1.A metallic element of atomic number 72 present together with zirconium to the extent of 1% to 5% in zirconium minerals. It is a poisonous, ductile metal with a brilliant silver luster, has an atomic weight of 178.49, and has a high melting point (2227° C). It is used in nuclear reactors, and incandescent lamps as a scavenger of oxygen and nitrogen. See also norium.

Related Words

atomic number 72, Hf, metal, metallic element
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