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