Websites on 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)