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ChemicalElements.com: Phosphorus
Basic information, atomic structure, and table of isotopes.
EnvironmentalChemistry.com: Phosphorus
Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Phosphorus
Basic physical and historical information.
LANL: Phosphorus
Properties, handling, production, and uses.
Lenntech: Phosphorus
Physical data, chemical properties, health and environmental effects.
Phosphorus
Data tables and historic information.
Radiochemistry of Phosphorus
Full text of the monograph by William T. Mullins and G. W. Leddicote (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
Visual Elements: Phosphorus
Image, general and physical information, source, uses, key isotopes, and ionisation energies.
WebElements: Phosphorus
Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Phosphorus
Properties of the element, including its history, applications, and characteristics.