Dubnium is a synthetic element created in laboratories. It has a short half life of 28 hours which makes its research very difficult. It does not occur in the earth’s crust naturally. It’s discovery was claimed by both the Russian institute for nuclear research and America Lawrence Berkeley Laboratory in 1970. the dispute was resolved in 1993 by IUPAC that credited its discovery to Dubna. The name Dubnium is drawn from the name of the research town. As so little of it has been created the melting and boiling point have not been analysed.
A. Ghiorso, et al