Visual Elements: Cobalt (Popularity: )

Image, general and physical information, source, uses, biological role, key isotopes, and ionisation energies.

EnvironmentalChemistry.com: Cobalt (Popularity: )

Atomic structure, chemical and physical properties, and table of nuclides.

Lenntech: Cobalt (Popularity: )

Physical data, chemical properties, health and environmental effects.

ChemicalElements.com: Cobalt (Popularity: )

Basic information, atomic structure, and isotopes.

Radiochemistry of Cobalt (Popularity: )

Full text of the monograph by L.C. Bate (Oak Ridge National Laboratory, Oak Ridge, Tennessee). ...

WebElements: Cobalt (Popularity: )

Extensive information on history, uses, occurrence, compounds, and properties of the element.

It's Elemental: Cobalt (Popularity: )

Basic physical and historical information.

USGS Minerals Information: Cobalt (Popularity: )

Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).

Wikipedia: Cobalt (Popularity: )

Properties of the element, including its history, applications, and charateristics.