ChemGlobe: Mendelevium
- Electronic and thermal data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/101.html

LANL: Mendelevium
- History, isotopes, uses, and properties.
- http://periodic.lanl.gov/elements/101.html

Lenntech: Mendelevium
- Physical data and chemical properties.
- http://www.lenntech.com/Periodic-chart-elements/Md-en.htm

EnvironmentalChemistry.com: Mendelevium
- Atomic structure, chemical and physical properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Md.html

Visual Elements: Mendelevium
- General and physical information, source, key isotopes.
- http://www.chemsoc.org/viselements/pages/mendelevium.html

ChemicalElements.com: Mendelevium
- Basic information, atomic structure, and isotopes.
- http://www.chemicalelements.com/elements/md.html

It's Elemental: Mendelevium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele101.html

The Columbia Encyclopedia: Mendelevium
- Brief overview for the general reader.
- http://www.bartleby.com/65/me/mendelev.html

Britanica Nobel Prizes: Mendelevium
- Overview and basic data.
- http://www.britannica.com/nobel/micro/386_87.html