- EnvironmentalChemistry.com: Americium - http://environmentalchemistry.com/yogi/periodic/am.html
- Atomic structure, properties, and table of nuclides.
- It's Elemental: Americium - http://education.jlab.org/itselemental/ele095.html
- Basic physical and historical information.
- ChemicalElements.com: Americium - http://www.chemicalelements.com/elements/am.html
- Basic information, atomic structure, and isotopes.
- Visual Elements: Americium - http://www.chemsoc.org/viselements/pages/americium.html
- Image, general and physical information, and key isotopes.
- Lenntech: Americium - http://www.lenntech.com/periodic-chart-elements/am-en.htm
- Physical data, chemical properties, health and environmental effects.
- LANL: Americium - http://periodic.lanl.gov/elements/95.html
- Basic information and history.
- ChemGlobe: Americium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/95.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Americium - http://www.webelements.com/webelements/elements/text/am/key.html
- Extensive information on history, uses, compounds, and properties.
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