- ChemGlobe: Mendelevium - Electronic and thermal data along with an isotope table.
- ChemicalElements.com: Mendelevium - Basic information, atomic structure, and isotopes.
- Encyclopedia Britanica: Mendelevium - Overview and basic data.
- EnvironmentalChemistry.com: Mendelevium - Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Mendelevium - Basic physical and historical information.
- Lenntech: Mendelevium - Physical data and chemical properties.
- The Free Dictionary: Mendelevium - Brief overview for the general reader.
- Visual Elements: Mendelevium - General and physical information, source, key isotopes.
- WebElements: Mendelevium - Extensive information on history and properties.
