Rutherfordium

ChemGlobe: Rutherfordium
Electronic and thermal data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/104.html

ChemicalElements.com: Rutherfordium
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/rf.html

EnvironmentalChemistry.com: Rutherfordium
Atomic structure and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Rf.html

It's Elemental: Rutherfordium
Basic physical and historical information.
http://education.jlab.org/itselemental/ele104.html

LANL: Rutherfordium
Basic information, history, and isotopes.
http://periodic.lanl.gov/elements/104.html

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

Visual Elements: Rutherfordium
Physical information, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/rutherfordium.html

WebElements: Rutherfordium
Information on history and properties.
http://www.webelements.com/webelements/elements/text/Rf/key.html