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ChemicalElements.com: Platinum

http://www.chemicalelements.com/elements/pt.html

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It's Elemental: Platinum

http://education.jlab.org/itselemental/ele078.html

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WebElements: Scandium

http://www.webelements.com/scandium/

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Wikipedia: Scandium

http://en.wikipedia.org/wiki/Scandium

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EnvironmentalChemistry.com: Scandium

http://environmentalchemistry.com/yogi/periodic/Sc.html

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USGS Minerals Information: Scandium

http://minerals.usgs.gov/minerals/pubs/commodity/scandium/

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