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It's Elemental: Promethium

http://education.jlab.org/itselemental/ele061.html

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Lenntech: Plutonium

http://www.lenntech.com/Periodic-chart-elements/Pu-en.htm

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http://www.lanl.gov/orgs/nmt/nmtdo/AQarchive/97winter/disposal.html

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EnvironmentalChemistry.com: Plutonium

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

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Chemical Elements.com - Plutonium (Pu)

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

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