- Visual Elements: Einsteinium - http://www.chemsoc.org/viselements/pages/einsteinium.html
- Discovery, general and physical information, and ionisation energies.
- ChemicalElements.com: Einsteinium - http://www.chemicalelements.com/elements/es.html
- Basic information, atomic structure, and table of isotopes.
- It's Elemental: Einsteinium - http://education.jlab.org/itselemental/ele099.html
- Basic physical and historical information.
- EnvironmentalChemistry.com: Einsteinium - http://environmentalchemistry.com/yogi/periodic/es.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Einsteinium - http://www.lenntech.com/periodic-chart-elements/es-en.htm
- Physical data and chemical properties.
- LANL: Einsteinium - http://periodic.lanl.gov/elements/99.html
- Basic information, history, and isotopes.
- ChemGlobe: Einsteinium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/99.html
- Electronic data along with an isotope table and basic facts.
- WebElements: Einsteinium - http://www.webelements.com/webelements/elements/text/es/key.html
- Extensive information on history, compounds, and properties.
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