Chromium

ChemGlobe: Chromium - Electronic, thermal, and steric data along with an isotopes table.
ChemicalElements.com: Chromium - Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Chromium - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Chromium - Basic physical and historical information.
LANL: Chromium - History, sources, uses, and compounds.
Lenntech: Chromium - Physical data, chemical properties, health and environmental effects.
USGS Minerals Information: Chromium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Visual Elements: Chromium - General and physical information, source, uses, key isotopes, and ionisation energies.
WebElements: Chromium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Chromium - Properties of the element, including its history, applications, and characteristics.
Radiochemistry of Chromium - Full text of the monograph by J. Pijck (Laboratory for Analytical Chemistry, University of Ghent, Ghent, Belgium). [PDF] (December, 1964)