Dubnium is a metal in Group VB and the 7th period. It is a synthetic element; none occurs naturally on earth.
The element was discovered by Ghiorso, Nurmia, Harris, K.A.Y. Eskola, and P.L. Eskola in 1970 at the University of California - Berkeley. It was named for the Joint Institute for Nuclear Research at Dubna, Russia.
Db is synthetic, just as are are all other elements beyond U. It was first made by bombarding 249Cf with a beam of 84 MeV Nitrogen nuclei.
262Db has a half-life of 1.8 seconds (as an alpha emitter).
Little is known about the chemistry of Dubnium. It is expected to have properties similar to Tantalum.