ChemicalElements.com: Einsteinium
Basic information, atomic structure, and table of isotopes.
Einsteinium
Data tables and historic information.
EnvironmentalChemistry.com: Einsteinium
Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Einsteinium
Basic physical and historical information.
Lenntech: Einsteinium
Physical data and chemical properties.
Visual Elements: Einsteinium
Discovery, general and physical information, and ionisation energies.
WebElements: Einsteinium
Extensive information on history, compounds, and properties.