Dubnium is a synthetic chemical element with symbol Db and atomic number 105. Dubnium is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of just over a day. This greatly limits the extent of research on dubnium..

Atomic Weight: 3243
Density:       423 g/cm3
Melting Point: 14
Boiling Point: 432