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ChemGlobe: Hafnium
Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/72.html
ChemicalElements.com: Hafnium
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/hf.html
EnvironmentalChemistry.com: Hafnium
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Hf.html
It's Elemental: Hafnium
Basic physical and historical information.
http://education.jlab.org/itselemental/ele072.html
LANL: Hafnium
History, properties, uses, and handling.
http://periodic.lanl.gov/elements/72.html
Lenntech: Hafnium
Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Hf-en.htm
Visual Elements: Hafnium
General and physical information, source, uses, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/hafnium.html
Wikipedia: Hafnium
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Hafnium
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