ChemGlobe: Antimony
   Electronic, thermal, and steric data along with an isotope table.
   http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/51.html

ChemicalElements.com: Antimony
   Basic information, atomic structure, and table of isotopes.
   http://www.chemicalelements.com/elements/sb.html

EnvironmentalChemistry.com: Antimony
   Atomic structure, properties, and table of nuclides.
   http://environmentalchemistry.com/yogi/periodic/Sb.html

It's Elemental: Antimony
   Basic physical and historical information.
   http://education.jlab.org/itselemental/ele051.html

LANL: Antimony
   History, sources, properties, and uses.
   http://periodic.lanl.gov/elements/51.html

Lenntech: Antimony
   Physical data, chemical properties, health and environmental effects.
   http://www.lenntech.com/Periodic-chart-elements/Sb-en.htm

Radiochemistry of Antimony
   Full text of the monograph by William J. Maeck (Phillips Petroleum Company, Atomic Energy Division, Idaho Falls, Idaho). [PDF]
   http://lib-www.lanl.gov/cgi-bin/getfile?rc000057.pdf

USGS Minerals Information: Antimony
   Overview and a number of publications in PDF format.
   http://minerals.usgs.gov/minerals/pubs/commodity/antimony/

Visual Elements: Antimony
   Image, source, uses, general and physical information, and key isotopes.
   http://www.chemsoc.org/viselements/pages/antimony.html

Wikipedia: Antimony
   Details the properties of the element, including its history, applications, and characteristics.
   http://en.wikipedia.org/wiki/Antimony