ChemicalElements.com: Dubnium - Diagram of its atomic structure, and basic information.
It's Elemental: Dubnium - Basic physical and historical information.
Dubnium - Historic information.
EnvironmentalChemistry.com: Dubnium - Atomic structure, physical properties, and table of nuclides.
WebElements: Dubnium - Information on history, isolation, and properties.
Lenntech: Dubnium - Physical data and chemical properties.
LANL: Dubnium - Basic information, history, and isotopes.
ChemGlobe: Dubnium - Electronic data along with an isotope table and basic facts.
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