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ChemicalElements.com: Promethium
Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Promethium
Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Promethium
Basic physical and historical information.
Lenntech: Promethium
Physical data, chemical properties, health and environmental effects.
WebElements: Promethium
Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Promethium
Properties of the element, including its history, applications, and characteristics.
[Periodic Table Mozilla]
Last update:
November 3, 2012 at 6:35:02 UTC
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