Definition: Hafnium is the name for the element with atomic number 72 and is represented by the symbol Hf.
It is a member of the transition metals group.
It is a member of the transition metals group.
Hafnium Definition
By Anne Marie Helmenstine, Ph.D., About.com Guide
Elemental hafnium metal, with a penny to indicate the scale.
U.S. Geological Survey
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