It's Elemental: Hafnium
Basic physical and historical information.
Wikipedia: Hafnium
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Hafnium
Atomic structure, chemical and physical properties, and table of nuclides.
ChemGlobe: Hafnium
Electronic, thermal, and steric data along with an isotope table.
LANL: Hafnium
History, properties, uses, and handling.
Britannica Nobel Prize: Hafnium
Detailed overview and data.
ChemicalElements.com: Hafnium
Basic information, atomic structure, and isotopes.
Visual Elements: Hafnium
General and physical information, source, uses, key isotopes, and ionisation energies.
Lenntech: Hafnium
Physical data, chemical properties, health and environmental effects.
Hafnium
Data tables and historic information.
WebElements: Hafnium
Extensive information on history, uses, occurrence, compounds, and properties.
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