Chromium

WebElements: Dubnium WebElements: Dubnium- Information on history, isolation, and properties. EnvironmentalChemistry.com: Dubnium EnvironmentalChemistry.com: Dubnium- Atomic structure, physical properties, and table of nuclides. It's Elemental: Dubnium It's Elemental: Dubnium- Basic physical and historical information. ChemicalElements.com: Dubnium ChemicalElements.com: Dubnium- Diagram of its atomic structure, and basic information.