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: 261
Density:       66.11
Melting Point: 85.1
Boiling Point: 86.62