Dubnium is a synthetic chemical element named after the town of Dubna in Russia.
Core Principles & Analysis
Both Dubna (1968) and Berkeley (1970) claimed element 105 during the 'Transfermium Wars'; IUPAC's 1997 compromise named it for Dubna, home of Russia's Joint Institute for Nuclear Research.
Dubnium-268 has a half-life of roughly a day, extraordinary for a superheavy element; it is collected as a decay product of moscovium and survives long enough for solution chemistry.
Chemical studies show dubnium behaves broadly like its group-5 homologs niobium and tantalum, but in some fluoride complexes it acts more like protactinium, defying simple periodic extrapolation.