ChemGlobe: Scandium
   Electronic, thermal, and steric data along with an isotope table.
   http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/21.html

ChemicalElements.com: Scandium
   Basic information, atomic structure, and isotopes.
   http://www.chemicalelements.com/elements/sc.html

Discovery of Scandium
   Article by Lars Fredrick Nilson.
   http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Disc-of-Scandium.html

EnvironmentalChemistry.com: Scandium
   Atomic structure, chemical and physical properties, and table of nuclides.
   http://environmentalchemistry.com/yogi/periodic/Sc.html

It's Elemental: Scandium
   Basic physical and historical information.
   http://education.jlab.org/itselemental/ele021.html

LANL: Scandium
   History, sources, properties, costs, and uses.
   http://periodic.lanl.gov/elements/21.html

USGS Minerals Information: Scandium
   Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
   http://minerals.usgs.gov/minerals/pubs/commodity/scandium/

Visual Elements: Scandium
   Image, animation, sources, use, physical information, and ionisation energies.
   http://www.chemsoc.org/viselements/pages/scandium.html

Wikipedia: Scandium
   Properties of the element, including its history, applications, and characteristics.
   http://en.wikipedia.org/wiki/Scandium