ChemGlobe: Einsteinium: Electronic data along with an isotope table and basic facts.
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.
LANL: Einsteinium: Basic information, history, and isotopes.
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.