It's Elemental: Osmium
Basic physical and historical information.
Wikipedia: Osmium
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Osmium
Atomic structure, chemical and physical properties, and table of nuclides.
Radiochemistry of Osmium
Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
ChemGlobe: Osmium
Electronic, thermal, and steric data along with an isotope table.
LANL: Osmium
Sources, properties, handling, and uses.
ChemicalElements.com: Osmium
Basic information, atomic structure, and isotopes.
Visual Elements: Osmium
General and physical information, source, uses, key isotopes, and ionisation energies.
Lenntech: Osmium
Physical data, chemical properties, health and environmental effects.
Osmium
Data tables and historic information.
WebElements: Osmium
Extensive information on history, uses, occurrence, compounds, and properties.
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