Atomic number 105
Atomic mass 261.9 g.mol -1
Melting point unknown
Boiling point unknown
Discovered Albert Ghiorso in 1970
The atomic weight of nine known isotopes range from 255 to 263; the longest-lived isotope, dubnium 268 has an half-life of 32 hours.
Dubnium does not have any application and little is known about it.
Dubnium is not found free in the environment, it is a synthetic element.
As it is so unstable, any amount formed would decompose to other elements so quickly that there’s no reason to study its effects on human health.
Due to its extremely short half-life (about 34 seconds), there’s no reason for considering the effects of dubnium in the environment.