ChemGlobe: Plutonium: Electronic, thermal, and steric data along with an isotope table.
Chemical Elements.com - Plutonium (Pu): Information on the chemical properties of plutonium, as well as its electron cloud diagram.
Chemlab: Plutonium: Gives a quick reference to the chemical properties of Plutonium, as well as an extensive list of its isotopes.
EnvironmentalChemistry.com: Plutonium: Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Plutonium: Basic physical and historical information.
LANL: Plutonium: Isotopes, uses, properties, and hazards.
Lenntech: Plutonium: Physical data, chemical properties, health and environmental effects.
Periodic Table : Scholar edition: Plutonium : Index of properties: Extensive information about nearly every chemical property of plutonium.
plutonium: Information about the history and properties of plutonium in paragraph form.
Plutonium: Provides a number of data tables with plutonium's chemical properties. It also contains an extensive history of plutonium.
Radiochemistry of Plutonium: Full text of the monograph by George H. Coleman (University of California, Lawrence Radiation Laboratory, Livermore, California). [PDF]
Superconductor: Plutonium: Describes the way that scientists found a way to use plutonium as a supercondutor.
TCAEP.co.uk: Science: Periodic Table: Elements: Plutonium: A concise table of the chemical properties of plutonium. Also includes the spelling of its name in several European languages.
The Actinide Research Quarterly: Winter 1997 : On the Disposal of Plutonium: An article that is an interview with a leading scientist on the disposal of plutonium.
Visual Elements: Plutonium: Image, general and physical information, source, uses, and key isotopes.
Webelements : Plutonium: Gives extensive information concerning Plutonium, including its compounds, history, and properties.