Sodium « Elements « Chemistry

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ChemGlobe: Sodium - Electronic, thermal, and steric data along with basic information.
ChemicalElements.com: Sodium - Basic information, atomic structure, and table of isotopes.
EnvironmentalChemistry.com: Sodium - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Sodium - Basic physical and historical information.
LANL: Sodium - Sources, properties, uses, and compounds.
Lenntech: Sodium - Physical data, chemical properties, health and environmental effects.
Visual Elements: Sodium - Image, animation, source, uses, key isotopes, and ionisation energies.
WebElements: Sodium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Sodium - Properties of the element, including its history, applications, and characteristics.
Radiochemistry of Sodium - Full text of the monograph by W. T. Mullins and G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (March, 1962)