- Visual Elements: Potassium - http://www.chemsoc.org/viselements/pages/potassium.html
- Image, animation, source, uses, physical information, and key isotopes.
- 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.
- EnvironmentalChemistry.com: Potassium - http://environmentalchemistry.com/yogi/periodic/k.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Potassium - http://www.lenntech.com/periodic-chart-elements/k-en.htm
- Physical data, chemical properties, and health effects.
- Wikipedia: Potassium - http://en.wikipedia.org/wiki/potassium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Potassium - http://periodic.lanl.gov/elements/19.html
- Sources, uses, properties, and isotopes.
- ChemGlobe: Potassium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/19.html
- Electronic, thermal, and steric data along with basic information.
- WebElements: Potassium - http://www.webelements.com/webelements/elements/text/k/key.html
- Extensive information on history, uses, occurrence, compounds, and properties of the element.
- Radiochemistry of Potassium - http://library.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).
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