Environmental Chemistry
Environmental chemistry.com: Periodic Table Berkelium
A nice summary of the chemical and physical properties of berkelium as well as additional information. Very nicely done and helpful.
Royal Society of Chemistry
Royal Society of Chemistry: Periodic Table
An interactive Periodic Table of the Elements that displays specific properties of each element
Other
Lanl: The Actinide Research Quarterly
This is "The Actinide Research Quarterly", a publication about current research of the actinide metals and nuclear materials technology by Los Alamos National Laboratory. Very detailed information.
Ducksters
Ducksters: Chemistry for Kids: Elements: Lanthanides and Actinides
Kids learn about the lanthanides and actinides of the periodic table. Find out which elements are in this group. properties, similarities, and other facts on this site.