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- Isotopes of dubnium - Dubnium (Db) has no stable isotopes. A standard atomic mass cannot be given.
- Dubnium - Dubnium (IPA: ), also called eka-tantalum, is a chemical element in the periodic table that has the symbol Db and atomic number 105.
- Group 5 element - A Group 5 element is one in the series of elements in group 5 (IUPAC style) in the periodic table, which consists of vanadium (V), niobium (Nb), tantalum (Ta), and dubnium (Db).