Dubnium - Db


Atomic number 105

Atomic mass 261.9 g.mol -1

Density unknown

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 in the environment

Dubnium is not found free in the environment, it is a synthetic element.

Health effects of dubnium

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.

Environmental effects of dubnium

Due to its extremely short half-life (about 34 seconds), there’s no reason for considering the effects of dubnium in the environment.