Berkelium

ChemGlobe: Berkelium
Electronic and thermal data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/97.html

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

The Columbia Encyclopedia: Berkelium
Overview for the general reader.
http://www.bartleby.com/65/be/berkeliu.html

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

It's Elemental: Berkelium
Basic physical and historical information.
http://education.jlab.org/itselemental/ele097.html

LANL: Berkelium
Basic information and history.
http://periodic.lanl.gov/elements/97.html

Lenntech: Berkelium
Physical data, chemical properties, and health effects.
http://www.lenntech.com/Periodic-chart-elements/Bk-en.htm

Visual Elements: Berkelium
General and physical information, and key isotopes.
http://www.chemsoc.org/viselements/pages/berkelium.html

WebElements: Berkelium
Extensive information on history, compounds, and properties.
http://www.webelements.com/webelements/elements/text/Bk/key.html