Potassium
Links
Visual Elements: Potassium
http://www.chemsoc.org/viselements/pages/potassium.html
Image, animation, source, uses, physical information, and key isotopes.
Radiochemistry of Potassium
http://lib-www.lanl.gov/cgi-bin/getfile?rc000016.pdf
Full text of the monograph by William T. Mullins and G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
It's Elemental: Potassium
http://education.jlab.org/itselemental/ele019.html
Basic physical and historical information.
ChemicalElements.com: Potassium
http://www.chemicalelements.com/elements/k.html
Basic information, atomic structure, and isotopes.
Potassium
http://www.scescape.net/~woods/elements/potassium.html
Data tables and historic information.
EnvironmentalChemistry.com: Potassium
http://environmentalchemistry.com/yogi/periodic/K.html
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Potassium
http://www.webelements.com/webelements/elements/text/K/key.html
Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Potassium
http://www.wikipedia.org/wiki/Potassium
Properties of the element, including its history, applications, and charateristics.
Lenntech: Potassium
http://www.lenntech.com/Periodic-chart-elements/K-en.htm
Physical data, chemical properties, and health effects.